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Finding the Fourth Proportional to 142.90, 197.24 and 90.47

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Solution

The fourth proportional to 142.90, 197.24 and 90.47 is: 124.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.90 : 197.24 = 90.47 : x
  2. Step 2: Convert to fraction form
    142.90/197.24 = 90.47/x
  3. Step 3: Cross multiply
    142.90x = 197.24 × 90.47
  4. Step 4: Simplify right side
    142.90x = 17,844.34
  5. Step 5: Solve for x
    x = 17,844.34/142.90
  6. Step 6: Final answer
    x = 124.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.