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Finding the Fourth Proportional to 109.93, 151.75 and 83.71

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Solution

The fourth proportional to 109.93, 151.75 and 83.71 is: 115.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.93 : 151.75 = 83.71 : x
  2. Step 2: Convert to fraction form
    109.93/151.75 = 83.71/x
  3. Step 3: Cross multiply
    109.93x = 151.75 × 83.71
  4. Step 4: Simplify right side
    109.93x = 12,702.40
  5. Step 5: Solve for x
    x = 12,702.40/109.93
  6. Step 6: Final answer
    x = 115.55

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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.