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Finding the Fourth Proportional to 159.86, 239.76 and 57.12

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Solution

The fourth proportional to 159.86, 239.76 and 57.12 is: 85.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.86 : 239.76 = 57.12 : x
  2. Step 2: Convert to fraction form
    159.86/239.76 = 57.12/x
  3. Step 3: Cross multiply
    159.86x = 239.76 × 57.12
  4. Step 4: Simplify right side
    159.86x = 13,695.78
  5. Step 5: Solve for x
    x = 13,695.78/159.86
  6. Step 6: Final answer
    x = 85.68

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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.