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Finding the Fourth Proportional to 1,242.72, 1,862.82 and 420.43

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Solution

The fourth proportional to 1,242.72, 1,862.82 and 420.43 is: 630.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.72 : 1,862.82 = 420.43 : x
  2. Step 2: Convert to fraction form
    1,242.72/1,862.82 = 420.43/x
  3. Step 3: Cross multiply
    1,242.72x = 1,862.82 × 420.43
  4. Step 4: Simplify right side
    1,242.72x = 783,182.81
  5. Step 5: Solve for x
    x = 783,182.81/1,242.72
  6. Step 6: Final answer
    x = 630.22

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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.