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Finding the Fourth Proportional to 579,411.80, 869,117.70 and 420,896.60

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Solution

The fourth proportional to 579,411.80, 869,117.70 and 420,896.60 is: 631,344.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,411.80 : 869,117.70 = 420,896.60 : x
  2. Step 2: Convert to fraction form
    579,411.80/869,117.70 = 420,896.60/x
  3. Step 3: Cross multiply
    579,411.80x = 869,117.70 × 420,896.60
  4. Step 4: Simplify right side
    579,411.80x = 365,808,684,929.82
  5. Step 5: Solve for x
    x = 365,808,684,929.82/579,411.80
  6. Step 6: Final answer
    x = 631,344.90

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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.