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Finding the Fourth Proportional to 878.39, 1,317.62 and 488.18

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Solution

The fourth proportional to 878.39, 1,317.62 and 488.18 is: 732.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.39 : 1,317.62 = 488.18 : x
  2. Step 2: Convert to fraction form
    878.39/1,317.62 = 488.18/x
  3. Step 3: Cross multiply
    878.39x = 1,317.62 × 488.18
  4. Step 4: Simplify right side
    878.39x = 643,230.09
  5. Step 5: Solve for x
    x = 643,230.09/878.39
  6. Step 6: Final answer
    x = 732.28

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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.