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Finding the Fourth Proportional to 66,207.87, 91,380.15 and 39,345.21

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Solution

The fourth proportional to 66,207.87, 91,380.15 and 39,345.21 is: 54,304.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,207.87 : 91,380.15 = 39,345.21 : x
  2. Step 2: Convert to fraction form
    66,207.87/91,380.15 = 39,345.21/x
  3. Step 3: Cross multiply
    66,207.87x = 91,380.15 × 39,345.21
  4. Step 4: Simplify right side
    66,207.87x = 3,595,371,191.58
  5. Step 5: Solve for x
    x = 3,595,371,191.58/66,207.87
  6. Step 6: Final answer
    x = 54,304.29

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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.