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Finding the Fourth Proportional to 878.75, 1,318.07 and 391.74

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Solution

The fourth proportional to 878.75, 1,318.07 and 391.74 is: 587.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.75 : 1,318.07 = 391.74 : x
  2. Step 2: Convert to fraction form
    878.75/1,318.07 = 391.74/x
  3. Step 3: Cross multiply
    878.75x = 1,318.07 × 391.74
  4. Step 4: Simplify right side
    878.75x = 516,336.78
  5. Step 5: Solve for x
    x = 516,336.78/878.75
  6. Step 6: Final answer
    x = 587.58

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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.