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Finding the Fourth Proportional to 878.60, 1,318.13 and 330.79

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Solution

The fourth proportional to 878.60, 1,318.13 and 330.79 is: 496.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.60 : 1,318.13 = 330.79 : x
  2. Step 2: Convert to fraction form
    878.60/1,318.13 = 330.79/x
  3. Step 3: Cross multiply
    878.60x = 1,318.13 × 330.79
  4. Step 4: Simplify right side
    878.60x = 436,024.22
  5. Step 5: Solve for x
    x = 436,024.22/878.60
  6. Step 6: Final answer
    x = 496.27

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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.