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Finding the Fourth Proportional to 147.80, 221.70 and 115.76

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Solution

The fourth proportional to 147.80, 221.70 and 115.76 is: 173.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.80 : 221.70 = 115.76 : x
  2. Step 2: Convert to fraction form
    147.80/221.70 = 115.76/x
  3. Step 3: Cross multiply
    147.80x = 221.70 × 115.76
  4. Step 4: Simplify right side
    147.80x = 25,663.99
  5. Step 5: Solve for x
    x = 25,663.99/147.80
  6. Step 6: Final answer
    x = 173.64

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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.