Home / 1,115.24-1,539.68-742.72

Finding the Fourth Proportional to 1,115.24, 1,539.68 and 742.72

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Solution

The fourth proportional to 1,115.24, 1,539.68 and 742.72 is: 1,025.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.24 : 1,539.68 = 742.72 : x
  2. Step 2: Convert to fraction form
    1,115.24/1,539.68 = 742.72/x
  3. Step 3: Cross multiply
    1,115.24x = 1,539.68 × 742.72
  4. Step 4: Simplify right side
    1,115.24x = 1,143,551.13
  5. Step 5: Solve for x
    x = 1,143,551.13/1,115.24
  6. Step 6: Final answer
    x = 1,025.39

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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.