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Finding the Fourth Proportional to 1,255.80, 1,731.42 and 923.16

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Solution

The fourth proportional to 1,255.80, 1,731.42 and 923.16 is: 1,272.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,255.80 : 1,731.42 = 923.16 : x
  2. Step 2: Convert to fraction form
    1,255.80/1,731.42 = 923.16/x
  3. Step 3: Cross multiply
    1,255.80x = 1,731.42 × 923.16
  4. Step 4: Simplify right side
    1,255.80x = 1,598,377.69
  5. Step 5: Solve for x
    x = 1,598,377.69/1,255.80
  6. Step 6: Final answer
    x = 1,272.80

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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.