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Finding the Fourth Proportional to 81,127.84, 121,689.92 and 36,722.40

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Solution

The fourth proportional to 81,127.84, 121,689.92 and 36,722.40 is: 55,082.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,127.84 : 121,689.92 = 36,722.40 : x
  2. Step 2: Convert to fraction form
    81,127.84/121,689.92 = 36,722.40/x
  3. Step 3: Cross multiply
    81,127.84x = 121,689.92 × 36,722.40
  4. Step 4: Simplify right side
    81,127.84x = 4,468,745,918.21
  5. Step 5: Solve for x
    x = 4,468,745,918.21/81,127.84
  6. Step 6: Final answer
    x = 55,082.77

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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.