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Finding the Fourth Proportional to 499.16, 748.40 and 239.20

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Solution

The fourth proportional to 499.16, 748.40 and 239.20 is: 358.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.16 : 748.40 = 239.20 : x
  2. Step 2: Convert to fraction form
    499.16/748.40 = 239.20/x
  3. Step 3: Cross multiply
    499.16x = 748.40 × 239.20
  4. Step 4: Simplify right side
    499.16x = 179,017.28
  5. Step 5: Solve for x
    x = 179,017.28/499.16
  6. Step 6: Final answer
    x = 358.64

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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.