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Finding the Fourth Proportional to 147.60, 221.31 and 66.51

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Solution

The fourth proportional to 147.60, 221.31 and 66.51 is: 99.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.60 : 221.31 = 66.51 : x
  2. Step 2: Convert to fraction form
    147.60/221.31 = 66.51/x
  3. Step 3: Cross multiply
    147.60x = 221.31 × 66.51
  4. Step 4: Simplify right side
    147.60x = 14,719.33
  5. Step 5: Solve for x
    x = 14,719.33/147.60
  6. Step 6: Final answer
    x = 99.72

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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.