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Finding the Fourth Proportional to 1,253.97, 1,728.67 and 879.79

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Solution

The fourth proportional to 1,253.97, 1,728.67 and 879.79 is: 1,212.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.97 : 1,728.67 = 879.79 : x
  2. Step 2: Convert to fraction form
    1,253.97/1,728.67 = 879.79/x
  3. Step 3: Cross multiply
    1,253.97x = 1,728.67 × 879.79
  4. Step 4: Simplify right side
    1,253.97x = 1,520,862.26
  5. Step 5: Solve for x
    x = 1,520,862.26/1,253.97
  6. Step 6: Final answer
    x = 1,212.84

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1.5x scale

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.