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Finding the Fourth Proportional to 140.34, 210.43 and 71.92

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Solution

The fourth proportional to 140.34, 210.43 and 71.92 is: 107.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.34 : 210.43 = 71.92 : x
  2. Step 2: Convert to fraction form
    140.34/210.43 = 71.92/x
  3. Step 3: Cross multiply
    140.34x = 210.43 × 71.92
  4. Step 4: Simplify right side
    140.34x = 15,134.48
  5. Step 5: Solve for x
    x = 15,134.48/140.34
  6. Step 6: Final answer
    x = 107.84

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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.