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Finding the Fourth Proportional to 498.20, 747.20 and 238.20

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Solution

The fourth proportional to 498.20, 747.20 and 238.20 is: 357.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.20 : 747.20 = 238.20 : x
  2. Step 2: Convert to fraction form
    498.20/747.20 = 238.20/x
  3. Step 3: Cross multiply
    498.20x = 747.20 × 238.20
  4. Step 4: Simplify right side
    498.20x = 177,983.04
  5. Step 5: Solve for x
    x = 177,983.04/498.20
  6. Step 6: Final answer
    x = 357.25

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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.