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Finding the Fourth Proportional to 1,331.46, 1,837.35 and 742.05

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Solution

The fourth proportional to 1,331.46, 1,837.35 and 742.05 is: 1,023.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.46 : 1,837.35 = 742.05 : x
  2. Step 2: Convert to fraction form
    1,331.46/1,837.35 = 742.05/x
  3. Step 3: Cross multiply
    1,331.46x = 1,837.35 × 742.05
  4. Step 4: Simplify right side
    1,331.46x = 1,363,405.57
  5. Step 5: Solve for x
    x = 1,363,405.57/1,331.46
  6. Step 6: Final answer
    x = 1,023.99

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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.