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Finding the Fourth Proportional to 579,338.10, 869,007.15 and 402,390.90

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Solution

The fourth proportional to 579,338.10, 869,007.15 and 402,390.90 is: 603,586.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,338.10 : 869,007.15 = 402,390.90 : x
  2. Step 2: Convert to fraction form
    579,338.10/869,007.15 = 402,390.90/x
  3. Step 3: Cross multiply
    579,338.10x = 869,007.15 × 402,390.90
  4. Step 4: Simplify right side
    579,338.10x = 349,680,569,194.94
  5. Step 5: Solve for x
    x = 349,680,569,194.94/579,338.10
  6. Step 6: Final answer
    x = 603,586.35

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.