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Finding the Fourth Proportional to 638.98, 958.36 and 249.16

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Solution

The fourth proportional to 638.98, 958.36 and 249.16 is: 373.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.98 : 958.36 = 249.16 : x
  2. Step 2: Convert to fraction form
    638.98/958.36 = 249.16/x
  3. Step 3: Cross multiply
    638.98x = 958.36 × 249.16
  4. Step 4: Simplify right side
    638.98x = 238,784.98
  5. Step 5: Solve for x
    x = 238,784.98/638.98
  6. Step 6: Final answer
    x = 373.70

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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.