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Finding the Fourth Proportional to 579,505.80, 869,258.70 and 439,537.80

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Solution

The fourth proportional to 579,505.80, 869,258.70 and 439,537.80 is: 659,306.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,505.80 : 869,258.70 = 439,537.80 : x
  2. Step 2: Convert to fraction form
    579,505.80/869,258.70 = 439,537.80/x
  3. Step 3: Cross multiply
    579,505.80x = 869,258.70 × 439,537.80
  4. Step 4: Simplify right side
    579,505.80x = 382,072,056,628.86
  5. Step 5: Solve for x
    x = 382,072,056,628.86/579,505.80
  6. Step 6: Final answer
    x = 659,306.70

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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.