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Finding the Fourth Proportional to 1,240.61, 1,713.20 and 799.28

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Solution

The fourth proportional to 1,240.61, 1,713.20 and 799.28 is: 1,103.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.61 : 1,713.20 = 799.28 : x
  2. Step 2: Convert to fraction form
    1,240.61/1,713.20 = 799.28/x
  3. Step 3: Cross multiply
    1,240.61x = 1,713.20 × 799.28
  4. Step 4: Simplify right side
    1,240.61x = 1,369,313.93
  5. Step 5: Solve for x
    x = 1,369,313.93/1,240.61
  6. Step 6: Final answer
    x = 1,103.75

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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.