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Finding the Fourth Proportional to 81,003.40, 121,505.10 and 72,474.10

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Solution

The fourth proportional to 81,003.40, 121,505.10 and 72,474.10 is: 108,711.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,003.40 : 121,505.10 = 72,474.10 : x
  2. Step 2: Convert to fraction form
    81,003.40/121,505.10 = 72,474.10/x
  3. Step 3: Cross multiply
    81,003.40x = 121,505.10 × 72,474.10
  4. Step 4: Simplify right side
    81,003.40x = 8,805,972,767.91
  5. Step 5: Solve for x
    x = 8,805,972,767.91/81,003.40
  6. Step 6: Final answer
    x = 108,711.15

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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.