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Finding the Fourth Proportional to 831.20, 1,248.84 and 539.28

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Solution

The fourth proportional to 831.20, 1,248.84 and 539.28 is: 810.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.20 : 1,248.84 = 539.28 : x
  2. Step 2: Convert to fraction form
    831.20/1,248.84 = 539.28/x
  3. Step 3: Cross multiply
    831.20x = 1,248.84 × 539.28
  4. Step 4: Simplify right side
    831.20x = 673,474.44
  5. Step 5: Solve for x
    x = 673,474.44/831.20
  6. Step 6: Final answer
    x = 810.25

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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.