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Finding the Fourth Proportional to 878.93, 1,209.28 and 667.88

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Solution

The fourth proportional to 878.93, 1,209.28 and 667.88 is: 918.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.93 : 1,209.28 = 667.88 : x
  2. Step 2: Convert to fraction form
    878.93/1,209.28 = 667.88/x
  3. Step 3: Cross multiply
    878.93x = 1,209.28 × 667.88
  4. Step 4: Simplify right side
    878.93x = 807,644.54
  5. Step 5: Solve for x
    x = 807,644.54/878.93
  6. Step 6: Final answer
    x = 918.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.