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Finding the Fourth Proportional to 72,487.28, 100,036.20 and 40,654.40

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Solution

The fourth proportional to 72,487.28, 100,036.20 and 40,654.40 is: 56,105.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,487.28 : 100,036.20 = 40,654.40 : x
  2. Step 2: Convert to fraction form
    72,487.28/100,036.20 = 40,654.40/x
  3. Step 3: Cross multiply
    72,487.28x = 100,036.20 × 40,654.40
  4. Step 4: Simplify right side
    72,487.28x = 4,066,911,689.28
  5. Step 5: Solve for x
    x = 4,066,911,689.28/72,487.28
  6. Step 6: Final answer
    x = 56,105.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.