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Finding the Fourth Proportional to 109.86, 151.42 and 83.60

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Solution

The fourth proportional to 109.86, 151.42 and 83.60 is: 115.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.86 : 151.42 = 83.60 : x
  2. Step 2: Convert to fraction form
    109.86/151.42 = 83.60/x
  3. Step 3: Cross multiply
    109.86x = 151.42 × 83.60
  4. Step 4: Simplify right side
    109.86x = 12,658.47
  5. Step 5: Solve for x
    x = 12,658.47/109.86
  6. Step 6: Final answer
    x = 115.23

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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.