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Finding the Fourth Proportional to 879.72, 1,319.94 and 489.66

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Solution

The fourth proportional to 879.72, 1,319.94 and 489.66 is: 734.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.72 : 1,319.94 = 489.66 : x
  2. Step 2: Convert to fraction form
    879.72/1,319.94 = 489.66/x
  3. Step 3: Cross multiply
    879.72x = 1,319.94 × 489.66
  4. Step 4: Simplify right side
    879.72x = 646,321.82
  5. Step 5: Solve for x
    x = 646,321.82/879.72
  6. Step 6: Final answer
    x = 734.69

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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.