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Finding the Fourth Proportional to 66,658.46, 91,990.13 and 39,795.95

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Solution

The fourth proportional to 66,658.46, 91,990.13 and 39,795.95 is: 54,919.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,658.46 : 91,990.13 = 39,795.95 : x
  2. Step 2: Convert to fraction form
    66,658.46/91,990.13 = 39,795.95/x
  3. Step 3: Cross multiply
    66,658.46x = 91,990.13 × 39,795.95
  4. Step 4: Simplify right side
    66,658.46x = 3,660,834,613.97
  5. Step 5: Solve for x
    x = 3,660,834,613.97/66,658.46
  6. Step 6: Final answer
    x = 54,919.28

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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.