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Finding the Fourth Proportional to 102.91, 153.17 and 99.63

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Solution

The fourth proportional to 102.91, 153.17 and 99.63 is: 148.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.91 : 153.17 = 99.63 : x
  2. Step 2: Convert to fraction form
    102.91/153.17 = 99.63/x
  3. Step 3: Cross multiply
    102.91x = 153.17 × 99.63
  4. Step 4: Simplify right side
    102.91x = 15,260.33
  5. Step 5: Solve for x
    x = 15,260.33/102.91
  6. Step 6: Final answer
    x = 148.29

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.