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Finding the Fourth Proportional to 398.78, 598.18 and 124.88

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Solution

The fourth proportional to 398.78, 598.18 and 124.88 is: 187.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.78 : 598.18 = 124.88 : x
  2. Step 2: Convert to fraction form
    398.78/598.18 = 124.88/x
  3. Step 3: Cross multiply
    398.78x = 598.18 × 124.88
  4. Step 4: Simplify right side
    398.78x = 74,700.72
  5. Step 5: Solve for x
    x = 74,700.72/398.78
  6. Step 6: Final answer
    x = 187.32

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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.