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Finding the Fourth Proportional to 639, 958.08 and 253.92

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Solution

The fourth proportional to 639, 958.08 and 253.92 is: 380.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    639 : 958.08 = 253.92 : x
  2. Step 2: Convert to fraction form
    639/958.08 = 253.92/x
  3. Step 3: Cross multiply
    639x = 958.08 × 253.92
  4. Step 4: Simplify right side
    639x = 243,275.67
  5. Step 5: Solve for x
    x = 243,275.67/639
  6. Step 6: Final answer
    x = 380.71

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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.