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Finding the Fourth Proportional to 272,891.40, 409,337.10 and 85,902.90

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Solution

The fourth proportional to 272,891.40, 409,337.10 and 85,902.90 is: 128,854.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,891.40 : 409,337.10 = 85,902.90 : x
  2. Step 2: Convert to fraction form
    272,891.40/409,337.10 = 85,902.90/x
  3. Step 3: Cross multiply
    272,891.40x = 409,337.10 × 85,902.90
  4. Step 4: Simplify right side
    272,891.40x = 35,163,243,967.59
  5. Step 5: Solve for x
    x = 35,163,243,967.59/272,891.40
  6. Step 6: Final answer
    x = 128,854.35

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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.