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Finding the Fourth Proportional to 752.15, 1,038.08 and 489.71

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Solution

The fourth proportional to 752.15, 1,038.08 and 489.71 is: 675.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.15 : 1,038.08 = 489.71 : x
  2. Step 2: Convert to fraction form
    752.15/1,038.08 = 489.71/x
  3. Step 3: Cross multiply
    752.15x = 1,038.08 × 489.71
  4. Step 4: Simplify right side
    752.15x = 508,358.16
  5. Step 5: Solve for x
    x = 508,358.16/752.15
  6. Step 6: Final answer
    x = 675.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.