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Finding the Fourth Proportional to 140.81, 211.19 and 38.10

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Solution

The fourth proportional to 140.81, 211.19 and 38.10 is: 57.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.81 : 211.19 = 38.10 : x
  2. Step 2: Convert to fraction form
    140.81/211.19 = 38.10/x
  3. Step 3: Cross multiply
    140.81x = 211.19 × 38.10
  4. Step 4: Simplify right side
    140.81x = 8,045.36
  5. Step 5: Solve for x
    x = 8,045.36/140.81
  6. Step 6: Final answer
    x = 57.14

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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.