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Finding the Fourth Proportional to 1,157.72, 1,734.96 and 831.56

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Solution

The fourth proportional to 1,157.72, 1,734.96 and 831.56 is: 1,246.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,157.72 : 1,734.96 = 831.56 : x
  2. Step 2: Convert to fraction form
    1,157.72/1,734.96 = 831.56/x
  3. Step 3: Cross multiply
    1,157.72x = 1,734.96 × 831.56
  4. Step 4: Simplify right side
    1,157.72x = 1,442,723.34
  5. Step 5: Solve for x
    x = 1,442,723.34/1,157.72
  6. Step 6: Final answer
    x = 1,246.18

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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.