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Finding the Fourth Proportional to 862.70, 1,290.92 and 742.41

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Solution

The fourth proportional to 862.70, 1,290.92 and 742.41 is: 1,110.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.70 : 1,290.92 = 742.41 : x
  2. Step 2: Convert to fraction form
    862.70/1,290.92 = 742.41/x
  3. Step 3: Cross multiply
    862.70x = 1,290.92 × 742.41
  4. Step 4: Simplify right side
    862.70x = 958,388.21
  5. Step 5: Solve for x
    x = 958,388.21/862.70
  6. Step 6: Final answer
    x = 1,110.92

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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.