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Finding the Fourth Proportional to 71,787.38, 99,066.58 and 39,955.59

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Solution

The fourth proportional to 71,787.38, 99,066.58 and 39,955.59 is: 55,138.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,787.38 : 99,066.58 = 39,955.59 : x
  2. Step 2: Convert to fraction form
    71,787.38/99,066.58 = 39,955.59/x
  3. Step 3: Cross multiply
    71,787.38x = 99,066.58 × 39,955.59
  4. Step 4: Simplify right side
    71,787.38x = 3,958,263,553.29
  5. Step 5: Solve for x
    x = 3,958,263,553.29/71,787.38
  6. Step 6: Final answer
    x = 55,138.71

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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.