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Finding the Fourth Proportional to 1,585.76, 2,378.90 and 489.87

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Solution

The fourth proportional to 1,585.76, 2,378.90 and 489.87 is: 734.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.76 : 2,378.90 = 489.87 : x
  2. Step 2: Convert to fraction form
    1,585.76/2,378.90 = 489.87/x
  3. Step 3: Cross multiply
    1,585.76x = 2,378.90 × 489.87
  4. Step 4: Simplify right side
    1,585.76x = 1,165,352.97
  5. Step 5: Solve for x
    x = 1,165,352.97/1,585.76
  6. Step 6: Final answer
    x = 734.88

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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.