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Finding the Fourth Proportional to 639.12, 958.44 and 503.76

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Solution

The fourth proportional to 639.12, 958.44 and 503.76 is: 755.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.12 : 958.44 = 503.76 : x
  2. Step 2: Convert to fraction form
    639.12/958.44 = 503.76/x
  3. Step 3: Cross multiply
    639.12x = 958.44 × 503.76
  4. Step 4: Simplify right side
    639.12x = 482,823.73
  5. Step 5: Solve for x
    x = 482,823.73/639.12
  6. Step 6: Final answer
    x = 755.45

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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.