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Finding the Fourth Proportional to 57,425.72, 86,138.59 and 17,985.92

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Solution

The fourth proportional to 57,425.72, 86,138.59 and 17,985.92 is: 26,978.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,425.72 : 86,138.59 = 17,985.92 : x
  2. Step 2: Convert to fraction form
    57,425.72/86,138.59 = 17,985.92/x
  3. Step 3: Cross multiply
    57,425.72x = 86,138.59 × 17,985.92
  4. Step 4: Simplify right side
    57,425.72x = 1,549,281,959.03
  5. Step 5: Solve for x
    x = 1,549,281,959.03/57,425.72
  6. Step 6: Final answer
    x = 26,978.88

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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.