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Finding the Fourth Proportional to 878.53, 1,318.41 and 648.02

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Solution

The fourth proportional to 878.53, 1,318.41 and 648.02 is: 972.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.53 : 1,318.41 = 648.02 : x
  2. Step 2: Convert to fraction form
    878.53/1,318.41 = 648.02/x
  3. Step 3: Cross multiply
    878.53x = 1,318.41 × 648.02
  4. Step 4: Simplify right side
    878.53x = 854,351.93
  5. Step 5: Solve for x
    x = 854,351.93/878.53
  6. Step 6: Final answer
    x = 972.48

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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.