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Finding the Fourth Proportional to 140.52, 211.61 and 122.70

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Solution

The fourth proportional to 140.52, 211.61 and 122.70 is: 184.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.52 : 211.61 = 122.70 : x
  2. Step 2: Convert to fraction form
    140.52/211.61 = 122.70/x
  3. Step 3: Cross multiply
    140.52x = 211.61 × 122.70
  4. Step 4: Simplify right side
    140.52x = 25,964.55
  5. Step 5: Solve for x
    x = 25,964.55/140.52
  6. Step 6: Final answer
    x = 184.77

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.