Home / 1,728.21-2,386.17-1,139.79

Finding the Fourth Proportional to 1,728.21, 2,386.17 and 1,139.79

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Solution

The fourth proportional to 1,728.21, 2,386.17 and 1,139.79 is: 1,573.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,728.21 : 2,386.17 = 1,139.79 : x
  2. Step 2: Convert to fraction form
    1,728.21/2,386.17 = 1,139.79/x
  3. Step 3: Cross multiply
    1,728.21x = 2,386.17 × 1,139.79
  4. Step 4: Simplify right side
    1,728.21x = 2,719,732.70
  5. Step 5: Solve for x
    x = 2,719,732.70/1,728.21
  6. Step 6: Final answer
    x = 1,573.73

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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.