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Finding the Fourth Proportional to 267.12, 398.58 and 239.86

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Solution

The fourth proportional to 267.12, 398.58 and 239.86 is: 357.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.12 : 398.58 = 239.86 : x
  2. Step 2: Convert to fraction form
    267.12/398.58 = 239.86/x
  3. Step 3: Cross multiply
    267.12x = 398.58 × 239.86
  4. Step 4: Simplify right side
    267.12x = 95,603.40
  5. Step 5: Solve for x
    x = 95,603.40/267.12
  6. Step 6: Final answer
    x = 357.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.