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Finding the Fourth Proportional to 878.76, 1,318.11 and 635.76

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Solution

The fourth proportional to 878.76, 1,318.11 and 635.76 is: 953.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.76 : 1,318.11 = 635.76 : x
  2. Step 2: Convert to fraction form
    878.76/1,318.11 = 635.76/x
  3. Step 3: Cross multiply
    878.76x = 1,318.11 × 635.76
  4. Step 4: Simplify right side
    878.76x = 838,001.61
  5. Step 5: Solve for x
    x = 838,001.61/878.76
  6. Step 6: Final answer
    x = 953.62

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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.