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Finding the Fourth Proportional to 831.52, 1,147.20 and 520.96

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Solution

The fourth proportional to 831.52, 1,147.20 and 520.96 is: 718.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.52 : 1,147.20 = 520.96 : x
  2. Step 2: Convert to fraction form
    831.52/1,147.20 = 520.96/x
  3. Step 3: Cross multiply
    831.52x = 1,147.20 × 520.96
  4. Step 4: Simplify right side
    831.52x = 597,645.31
  5. Step 5: Solve for x
    x = 597,645.31/831.52
  6. Step 6: Final answer
    x = 718.74

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1.5x scale

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.