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Finding the Fourth Proportional to 147.68, 221.50 and 86.72

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Solution

The fourth proportional to 147.68, 221.50 and 86.72 is: 130.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.68 : 221.50 = 86.72 : x
  2. Step 2: Convert to fraction form
    147.68/221.50 = 86.72/x
  3. Step 3: Cross multiply
    147.68x = 221.50 × 86.72
  4. Step 4: Simplify right side
    147.68x = 19,208.48
  5. Step 5: Solve for x
    x = 19,208.48/147.68
  6. Step 6: Final answer
    x = 130.07

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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.