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Finding the Fourth Proportional to 879.69, 1,317.45 and 489.12

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Solution

The fourth proportional to 879.69, 1,317.45 and 489.12 is: 732.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.69 : 1,317.45 = 489.12 : x
  2. Step 2: Convert to fraction form
    879.69/1,317.45 = 489.12/x
  3. Step 3: Cross multiply
    879.69x = 1,317.45 × 489.12
  4. Step 4: Simplify right side
    879.69x = 644,391.14
  5. Step 5: Solve for x
    x = 644,391.14/879.69
  6. Step 6: Final answer
    x = 732.52

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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.