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Finding the Fourth Proportional to 831.92, 1,247.72 and 284.05

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Solution

The fourth proportional to 831.92, 1,247.72 and 284.05 is: 426.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.92 : 1,247.72 = 284.05 : x
  2. Step 2: Convert to fraction form
    831.92/1,247.72 = 284.05/x
  3. Step 3: Cross multiply
    831.92x = 1,247.72 × 284.05
  4. Step 4: Simplify right side
    831.92x = 354,408.63
  5. Step 5: Solve for x
    x = 354,408.63/831.92
  6. Step 6: Final answer
    x = 426.01

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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.