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Finding the Fourth Proportional to 1,110.57, 1,531.65 and 831.47

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Solution

The fourth proportional to 1,110.57, 1,531.65 and 831.47 is: 1,146.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,110.57 : 1,531.65 = 831.47 : x
  2. Step 2: Convert to fraction form
    1,110.57/1,531.65 = 831.47/x
  3. Step 3: Cross multiply
    1,110.57x = 1,531.65 × 831.47
  4. Step 4: Simplify right side
    1,110.57x = 1,273,516.49
  5. Step 5: Solve for x
    x = 1,273,516.49/1,110.57
  6. Step 6: Final answer
    x = 1,146.73

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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.