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Finding the Fourth Proportional to 109.86, 151.68 and 71.16

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Solution

The fourth proportional to 109.86, 151.68 and 71.16 is: 98.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.86 : 151.68 = 71.16 : x
  2. Step 2: Convert to fraction form
    109.86/151.68 = 71.16/x
  3. Step 3: Cross multiply
    109.86x = 151.68 × 71.16
  4. Step 4: Simplify right side
    109.86x = 10,793.55
  5. Step 5: Solve for x
    x = 10,793.55/109.86
  6. Step 6: Final answer
    x = 98.25

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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.