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Finding the Fourth Proportional to 831.72, 1,145.64 and 691.56

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Solution

The fourth proportional to 831.72, 1,145.64 and 691.56 is: 952.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.72 : 1,145.64 = 691.56 : x
  2. Step 2: Convert to fraction form
    831.72/1,145.64 = 691.56/x
  3. Step 3: Cross multiply
    831.72x = 1,145.64 × 691.56
  4. Step 4: Simplify right side
    831.72x = 792,278.80
  5. Step 5: Solve for x
    x = 792,278.80/831.72
  6. Step 6: Final answer
    x = 952.58

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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.