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Finding the Fourth Proportional to 140.13, 210.39 and 91.71

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Solution

The fourth proportional to 140.13, 210.39 and 91.71 is: 137.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.13 : 210.39 = 91.71 : x
  2. Step 2: Convert to fraction form
    140.13/210.39 = 91.71/x
  3. Step 3: Cross multiply
    140.13x = 210.39 × 91.71
  4. Step 4: Simplify right side
    140.13x = 19,294.87
  5. Step 5: Solve for x
    x = 19,294.87/140.13
  6. Step 6: Final answer
    x = 137.69

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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.