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Finding the Fourth Proportional to 837.10, 1,255.65 and 831.70

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Solution

The fourth proportional to 837.10, 1,255.65 and 831.70 is: 1,247.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.10 : 1,255.65 = 831.70 : x
  2. Step 2: Convert to fraction form
    837.10/1,255.65 = 831.70/x
  3. Step 3: Cross multiply
    837.10x = 1,255.65 × 831.70
  4. Step 4: Simplify right side
    837.10x = 1,044,324.11
  5. Step 5: Solve for x
    x = 1,044,324.11/837.10
  6. Step 6: Final answer
    x = 1,247.55

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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.