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Finding the Fourth Proportional to 99.31, 148.97 and 34.30

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Solution

The fourth proportional to 99.31, 148.97 and 34.30 is: 51.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.31 : 148.97 = 34.30 : x
  2. Step 2: Convert to fraction form
    99.31/148.97 = 34.30/x
  3. Step 3: Cross multiply
    99.31x = 148.97 × 34.30
  4. Step 4: Simplify right side
    99.31x = 5,109.67
  5. Step 5: Solve for x
    x = 5,109.67/99.31
  6. Step 6: Final answer
    x = 51.45

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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.