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Finding the Fourth Proportional to 155.28, 231.57 and 147.18

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Solution

The fourth proportional to 155.28, 231.57 and 147.18 is: 219.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.28 : 231.57 = 147.18 : x
  2. Step 2: Convert to fraction form
    155.28/231.57 = 147.18/x
  3. Step 3: Cross multiply
    155.28x = 231.57 × 147.18
  4. Step 4: Simplify right side
    155.28x = 34,082.47
  5. Step 5: Solve for x
    x = 34,082.47/155.28
  6. Step 6: Final answer
    x = 219.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.