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Finding the Fourth Proportional to 398.53, 597.86 and 138.60

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Solution

The fourth proportional to 398.53, 597.86 and 138.60 is: 207.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.53 : 597.86 = 138.60 : x
  2. Step 2: Convert to fraction form
    398.53/597.86 = 138.60/x
  3. Step 3: Cross multiply
    398.53x = 597.86 × 138.60
  4. Step 4: Simplify right side
    398.53x = 82,863.40
  5. Step 5: Solve for x
    x = 82,863.40/398.53
  6. Step 6: Final answer
    x = 207.92

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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.