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Finding the Fourth Proportional to 140.39, 210.58 and 71.94

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Solution

The fourth proportional to 140.39, 210.58 and 71.94 is: 107.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.39 : 210.58 = 71.94 : x
  2. Step 2: Convert to fraction form
    140.39/210.58 = 71.94/x
  3. Step 3: Cross multiply
    140.39x = 210.58 × 71.94
  4. Step 4: Simplify right side
    140.39x = 15,149.13
  5. Step 5: Solve for x
    x = 15,149.13/140.39
  6. Step 6: Final answer
    x = 107.91

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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.