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Finding the Fourth Proportional to 66,421.53, 91,662.12 and 39,565.17

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Solution

The fourth proportional to 66,421.53, 91,662.12 and 39,565.17 is: 54,600.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,421.53 : 91,662.12 = 39,565.17 : x
  2. Step 2: Convert to fraction form
    66,421.53/91,662.12 = 39,565.17/x
  3. Step 3: Cross multiply
    66,421.53x = 91,662.12 × 39,565.17
  4. Step 4: Simplify right side
    66,421.53x = 3,626,627,360.36
  5. Step 5: Solve for x
    x = 3,626,627,360.36/66,421.53
  6. Step 6: Final answer
    x = 54,600.18

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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.