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Finding the Fourth Proportional to 1,131.75, 1,562.65 and 911.70

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Solution

The fourth proportional to 1,131.75, 1,562.65 and 911.70 is: 1,258.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.75 : 1,562.65 = 911.70 : x
  2. Step 2: Convert to fraction form
    1,131.75/1,562.65 = 911.70/x
  3. Step 3: Cross multiply
    1,131.75x = 1,562.65 × 911.70
  4. Step 4: Simplify right side
    1,131.75x = 1,424,665.73
  5. Step 5: Solve for x
    x = 1,424,665.73/1,131.75
  6. Step 6: Final answer
    x = 1,258.82

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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.