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Finding the Fourth Proportional to 268.80, 402.90 and 147.20

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Solution

The fourth proportional to 268.80, 402.90 and 147.20 is: 220.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.80 : 402.90 = 147.20 : x
  2. Step 2: Convert to fraction form
    268.80/402.90 = 147.20/x
  3. Step 3: Cross multiply
    268.80x = 402.90 × 147.20
  4. Step 4: Simplify right side
    268.80x = 59,304.87
  5. Step 5: Solve for x
    x = 59,304.87/268.80
  6. Step 6: Final answer
    x = 220.63

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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.