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Finding the Fourth Proportional to 142.47, 213.90 and 74.05

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Solution

The fourth proportional to 142.47, 213.90 and 74.05 is: 111.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.47 : 213.90 = 74.05 : x
  2. Step 2: Convert to fraction form
    142.47/213.90 = 74.05/x
  3. Step 3: Cross multiply
    142.47x = 213.90 × 74.05
  4. Step 4: Simplify right side
    142.47x = 15,839.30
  5. Step 5: Solve for x
    x = 15,839.30/142.47
  6. Step 6: Final answer
    x = 111.18

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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.