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Finding the Fourth Proportional to 1,242.38, 1,862.31 and 549.43

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Solution

The fourth proportional to 1,242.38, 1,862.31 and 549.43 is: 823.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.38 : 1,862.31 = 549.43 : x
  2. Step 2: Convert to fraction form
    1,242.38/1,862.31 = 549.43/x
  3. Step 3: Cross multiply
    1,242.38x = 1,862.31 × 549.43
  4. Step 4: Simplify right side
    1,242.38x = 1,023,208.98
  5. Step 5: Solve for x
    x = 1,023,208.98/1,242.38
  6. Step 6: Final answer
    x = 823.59

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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.