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Finding the Fourth Proportional to 2,718.79, 4,080.18 and 1,239.68

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Solution

The fourth proportional to 2,718.79, 4,080.18 and 1,239.68 is: 1,860.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,718.79 : 4,080.18 = 1,239.68 : x
  2. Step 2: Convert to fraction form
    2,718.79/4,080.18 = 1,239.68/x
  3. Step 3: Cross multiply
    2,718.79x = 4,080.18 × 1,239.68
  4. Step 4: Simplify right side
    2,718.79x = 5,058,117.54
  5. Step 5: Solve for x
    x = 5,058,117.54/2,718.79
  6. Step 6: Final answer
    x = 1,860.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.