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Finding the Fourth Proportional to 1,242.09, 1,863.09 and 420.30

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Solution

The fourth proportional to 1,242.09, 1,863.09 and 420.30 is: 630.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.09 : 1,863.09 = 420.30 : x
  2. Step 2: Convert to fraction form
    1,242.09/1,863.09 = 420.30/x
  3. Step 3: Cross multiply
    1,242.09x = 1,863.09 × 420.30
  4. Step 4: Simplify right side
    1,242.09x = 783,056.73
  5. Step 5: Solve for x
    x = 783,056.73/1,242.09
  6. Step 6: Final answer
    x = 630.43

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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.