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Finding the Fourth Proportional to 878.94, 1,318.38 and 391.62

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Solution

The fourth proportional to 878.94, 1,318.38 and 391.62 is: 587.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.94 : 1,318.38 = 391.62 : x
  2. Step 2: Convert to fraction form
    878.94/1,318.38 = 391.62/x
  3. Step 3: Cross multiply
    878.94x = 1,318.38 × 391.62
  4. Step 4: Simplify right side
    878.94x = 516,303.98
  5. Step 5: Solve for x
    x = 516,303.98/878.94
  6. Step 6: Final answer
    x = 587.42

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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.