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Finding the Fourth Proportional to 147.18, 220.77 and 99.39

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Solution

The fourth proportional to 147.18, 220.77 and 99.39 is: 149.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.18 : 220.77 = 99.39 : x
  2. Step 2: Convert to fraction form
    147.18/220.77 = 99.39/x
  3. Step 3: Cross multiply
    147.18x = 220.77 × 99.39
  4. Step 4: Simplify right side
    147.18x = 21,942.33
  5. Step 5: Solve for x
    x = 21,942.33/147.18
  6. Step 6: Final answer
    x = 149.09

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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.