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Finding the Fourth Proportional to 39,987, 59,980.86 and 13,691.97

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Solution

The fourth proportional to 39,987, 59,980.86 and 13,691.97 is: 20,538.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,987 : 59,980.86 = 13,691.97 : x
  2. Step 2: Convert to fraction form
    39,987/59,980.86 = 13,691.97/x
  3. Step 3: Cross multiply
    39,987x = 59,980.86 × 13,691.97
  4. Step 4: Simplify right side
    39,987x = 821,256,135.69
  5. Step 5: Solve for x
    x = 821,256,135.69/39,987
  6. Step 6: Final answer
    x = 20,538.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.