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Finding the Fourth Proportional to 140.72, 211.05 and 49.42

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Solution

The fourth proportional to 140.72, 211.05 and 49.42 is: 74.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.72 : 211.05 = 49.42 : x
  2. Step 2: Convert to fraction form
    140.72/211.05 = 49.42/x
  3. Step 3: Cross multiply
    140.72x = 211.05 × 49.42
  4. Step 4: Simplify right side
    140.72x = 10,430.09
  5. Step 5: Solve for x
    x = 10,430.09/140.72
  6. Step 6: Final answer
    x = 74.12

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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.