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Finding the Fourth Proportional to 66,489.90, 91,743.51 and 39,634.92

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Solution

The fourth proportional to 66,489.90, 91,743.51 and 39,634.92 is: 54,688.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,489.90 : 91,743.51 = 39,634.92 : x
  2. Step 2: Convert to fraction form
    66,489.90/91,743.51 = 39,634.92/x
  3. Step 3: Cross multiply
    66,489.90x = 91,743.51 × 39,634.92
  4. Step 4: Simplify right side
    66,489.90x = 3,636,246,679.37
  5. Step 5: Solve for x
    x = 3,636,246,679.37/66,489.90
  6. Step 6: Final answer
    x = 54,688.71

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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.