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Finding the Fourth Proportional to 878.96, 1,318.50 and 391.88

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Solution

The fourth proportional to 878.96, 1,318.50 and 391.88 is: 587.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.96 : 1,318.50 = 391.88 : x
  2. Step 2: Convert to fraction form
    878.96/1,318.50 = 391.88/x
  3. Step 3: Cross multiply
    878.96x = 1,318.50 × 391.88
  4. Step 4: Simplify right side
    878.96x = 516,687.19
  5. Step 5: Solve for x
    x = 516,687.19/878.96
  6. Step 6: Final answer
    x = 587.84

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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.