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Finding the Fourth Proportional to 831.84, 1,252.73 and 724.92

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Solution

The fourth proportional to 831.84, 1,252.73 and 724.92 is: 1,091.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.84 : 1,252.73 = 724.92 : x
  2. Step 2: Convert to fraction form
    831.84/1,252.73 = 724.92/x
  3. Step 3: Cross multiply
    831.84x = 1,252.73 × 724.92
  4. Step 4: Simplify right side
    831.84x = 908,125.41
  5. Step 5: Solve for x
    x = 908,125.41/831.84
  6. Step 6: Final answer
    x = 1,091.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.