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Finding the Fourth Proportional to 1,242.15, 1,863.24 and 420.44

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Solution

The fourth proportional to 1,242.15, 1,863.24 and 420.44 is: 630.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.15 : 1,863.24 = 420.44 : x
  2. Step 2: Convert to fraction form
    1,242.15/1,863.24 = 420.44/x
  3. Step 3: Cross multiply
    1,242.15x = 1,863.24 × 420.44
  4. Step 4: Simplify right side
    1,242.15x = 783,371.31
  5. Step 5: Solve for x
    x = 783,371.31/1,242.15
  6. Step 6: Final answer
    x = 630.66

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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.