Home / 1,115.11-1,539.30-742.42

Finding the Fourth Proportional to 1,115.11, 1,539.30 and 742.42

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Solution

The fourth proportional to 1,115.11, 1,539.30 and 742.42 is: 1,024.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.11 : 1,539.30 = 742.42 : x
  2. Step 2: Convert to fraction form
    1,115.11/1,539.30 = 742.42/x
  3. Step 3: Cross multiply
    1,115.11x = 1,539.30 × 742.42
  4. Step 4: Simplify right side
    1,115.11x = 1,142,807.11
  5. Step 5: Solve for x
    x = 1,142,807.11/1,115.11
  6. Step 6: Final answer
    x = 1,024.84

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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.