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Finding the Fourth Proportional to 831.42, 1,145.25 and 634.59

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Solution

The fourth proportional to 831.42, 1,145.25 and 634.59 is: 874.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.42 : 1,145.25 = 634.59 : x
  2. Step 2: Convert to fraction form
    831.42/1,145.25 = 634.59/x
  3. Step 3: Cross multiply
    831.42x = 1,145.25 × 634.59
  4. Step 4: Simplify right side
    831.42x = 726,764.20
  5. Step 5: Solve for x
    x = 726,764.20/831.42
  6. Step 6: Final answer
    x = 874.12

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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.