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Finding the Fourth Proportional to 878.59, 1,317.88 and 489.18

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Solution

The fourth proportional to 878.59, 1,317.88 and 489.18 is: 733.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.59 : 1,317.88 = 489.18 : x
  2. Step 2: Convert to fraction form
    878.59/1,317.88 = 489.18/x
  3. Step 3: Cross multiply
    878.59x = 1,317.88 × 489.18
  4. Step 4: Simplify right side
    878.59x = 644,681.15
  5. Step 5: Solve for x
    x = 644,681.15/878.59
  6. Step 6: Final answer
    x = 733.77

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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.