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Finding the Fourth Proportional to 927.15, 1,391.31 and 489.18

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Solution

The fourth proportional to 927.15, 1,391.31 and 489.18 is: 734.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.15 : 1,391.31 = 489.18 : x
  2. Step 2: Convert to fraction form
    927.15/1,391.31 = 489.18/x
  3. Step 3: Cross multiply
    927.15x = 1,391.31 × 489.18
  4. Step 4: Simplify right side
    927.15x = 680,601.03
  5. Step 5: Solve for x
    x = 680,601.03/927.15
  6. Step 6: Final answer
    x = 734.08

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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.