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Finding the Fourth Proportional to 147.71, 221.45 and 128.13

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Solution

The fourth proportional to 147.71, 221.45 and 128.13 is: 192.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.71 : 221.45 = 128.13 : x
  2. Step 2: Convert to fraction form
    147.71/221.45 = 128.13/x
  3. Step 3: Cross multiply
    147.71x = 221.45 × 128.13
  4. Step 4: Simplify right side
    147.71x = 28,373.75
  5. Step 5: Solve for x
    x = 28,373.75/147.71
  6. Step 6: Final answer
    x = 192.10

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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.