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Finding the Fourth Proportional to 100.12, 148.97 and 97.64

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Solution

The fourth proportional to 100.12, 148.97 and 97.64 is: 145.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.12 : 148.97 = 97.64 : x
  2. Step 2: Convert to fraction form
    100.12/148.97 = 97.64/x
  3. Step 3: Cross multiply
    100.12x = 148.97 × 97.64
  4. Step 4: Simplify right side
    100.12x = 14,545.43
  5. Step 5: Solve for x
    x = 14,545.43/100.12
  6. Step 6: Final answer
    x = 145.28

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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.