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Finding the Fourth Proportional to 71,690.43, 98,933.39 and 39,425.81

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Solution

The fourth proportional to 71,690.43, 98,933.39 and 39,425.81 is: 54,407.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,690.43 : 98,933.39 = 39,425.81 : x
  2. Step 2: Convert to fraction form
    71,690.43/98,933.39 = 39,425.81/x
  3. Step 3: Cross multiply
    71,690.43x = 98,933.39 × 39,425.81
  4. Step 4: Simplify right side
    71,690.43x = 3,900,528,345.00
  5. Step 5: Solve for x
    x = 3,900,528,345.00/71,690.43
  6. Step 6: Final answer
    x = 54,407.94

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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.