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Finding the Fourth Proportional to 1,240.72, 1,711.42 and 797.85

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Solution

The fourth proportional to 1,240.72, 1,711.42 and 797.85 is: 1,100.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.72 : 1,711.42 = 797.85 : x
  2. Step 2: Convert to fraction form
    1,240.72/1,711.42 = 797.85/x
  3. Step 3: Cross multiply
    1,240.72x = 1,711.42 × 797.85
  4. Step 4: Simplify right side
    1,240.72x = 1,365,454.45
  5. Step 5: Solve for x
    x = 1,365,454.45/1,240.72
  6. Step 6: Final answer
    x = 1,100.54

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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.