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Finding the Fourth Proportional to 147.08, 220.21 and 86.10

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Solution

The fourth proportional to 147.08, 220.21 and 86.10 is: 128.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.08 : 220.21 = 86.10 : x
  2. Step 2: Convert to fraction form
    147.08/220.21 = 86.10/x
  3. Step 3: Cross multiply
    147.08x = 220.21 × 86.10
  4. Step 4: Simplify right side
    147.08x = 18,959.87
  5. Step 5: Solve for x
    x = 18,959.87/147.08
  6. Step 6: Final answer
    x = 128.91

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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.