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Finding the Fourth Proportional to 66,489.12, 91,766.39 and 63,499.68

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Solution

The fourth proportional to 66,489.12, 91,766.39 and 63,499.68 is: 87,640.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,489.12 : 91,766.39 = 63,499.68 : x
  2. Step 2: Convert to fraction form
    66,489.12/91,766.39 = 63,499.68/x
  3. Step 3: Cross multiply
    66,489.12x = 91,766.39 × 63,499.68
  4. Step 4: Simplify right side
    66,489.12x = 5,827,136,082.26
  5. Step 5: Solve for x
    x = 5,827,136,082.26/66,489.12
  6. Step 6: Final answer
    x = 87,640.45

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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.