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Finding the Fourth Proportional to 523,423.40, 785,135.10 and 129,439.40

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Solution

The fourth proportional to 523,423.40, 785,135.10 and 129,439.40 is: 194,159.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    523,423.40 : 785,135.10 = 129,439.40 : x
  2. Step 2: Convert to fraction form
    523,423.40/785,135.10 = 129,439.40/x
  3. Step 3: Cross multiply
    523,423.40x = 785,135.10 × 129,439.40
  4. Step 4: Simplify right side
    523,423.40x = 101,627,416,262.94
  5. Step 5: Solve for x
    x = 101,627,416,262.94/523,423.40
  6. Step 6: Final answer
    x = 194,159.10

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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.