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Finding the Fourth Proportional to 147.39, 220.98 and 99.21

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Solution

The fourth proportional to 147.39, 220.98 and 99.21 is: 148.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.39 : 220.98 = 99.21 : x
  2. Step 2: Convert to fraction form
    147.39/220.98 = 99.21/x
  3. Step 3: Cross multiply
    147.39x = 220.98 × 99.21
  4. Step 4: Simplify right side
    147.39x = 21,923.43
  5. Step 5: Solve for x
    x = 21,923.43/147.39
  6. Step 6: Final answer
    x = 148.74

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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.