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Finding the Fourth Proportional to 878.24, 1,317.20 and 261.80

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Solution

The fourth proportional to 878.24, 1,317.20 and 261.80 is: 392.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.24 : 1,317.20 = 261.80 : x
  2. Step 2: Convert to fraction form
    878.24/1,317.20 = 261.80/x
  3. Step 3: Cross multiply
    878.24x = 1,317.20 × 261.80
  4. Step 4: Simplify right side
    878.24x = 344,842.96
  5. Step 5: Solve for x
    x = 344,842.96/878.24
  6. Step 6: Final answer
    x = 392.65

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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.