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Finding the Fourth Proportional to 147.48, 221.24 and 79

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Solution

The fourth proportional to 147.48, 221.24 and 79 is: 118.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.48 : 221.24 = 79 : x
  2. Step 2: Convert to fraction form
    147.48/221.24 = 79/x
  3. Step 3: Cross multiply
    147.48x = 221.24 × 79
  4. Step 4: Simplify right side
    147.48x = 17,477.96
  5. Step 5: Solve for x
    x = 17,477.96/147.48
  6. Step 6: Final answer
    x = 118.51

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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.