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Finding the Fourth Proportional to 831.30, 1,245.39 and 695.22

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Solution

The fourth proportional to 831.30, 1,245.39 and 695.22 is: 1,041.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.30 : 1,245.39 = 695.22 : x
  2. Step 2: Convert to fraction form
    831.30/1,245.39 = 695.22/x
  3. Step 3: Cross multiply
    831.30x = 1,245.39 × 695.22
  4. Step 4: Simplify right side
    831.30x = 865,820.04
  5. Step 5: Solve for x
    x = 865,820.04/831.30
  6. Step 6: Final answer
    x = 1,041.53

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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.