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Finding the Fourth Proportional to 1,226.32, 1,839.80 and 742.48

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Solution

The fourth proportional to 1,226.32, 1,839.80 and 742.48 is: 1,113.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.32 : 1,839.80 = 742.48 : x
  2. Step 2: Convert to fraction form
    1,226.32/1,839.80 = 742.48/x
  3. Step 3: Cross multiply
    1,226.32x = 1,839.80 × 742.48
  4. Step 4: Simplify right side
    1,226.32x = 1,366,014.70
  5. Step 5: Solve for x
    x = 1,366,014.70/1,226.32
  6. Step 6: Final answer
    x = 1,113.91

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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.