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Finding the Fourth Proportional to 878.44, 1,318.92 and 781.24

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Solution

The fourth proportional to 878.44, 1,318.92 and 781.24 is: 1,172.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.44 : 1,318.92 = 781.24 : x
  2. Step 2: Convert to fraction form
    878.44/1,318.92 = 781.24/x
  3. Step 3: Cross multiply
    878.44x = 1,318.92 × 781.24
  4. Step 4: Simplify right side
    878.44x = 1,030,393.06
  5. Step 5: Solve for x
    x = 1,030,393.06/878.44
  6. Step 6: Final answer
    x = 1,172.98

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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.