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Finding the Fourth Proportional to 1,242.48, 1,863.72 and 1,240.68

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Solution

The fourth proportional to 1,242.48, 1,863.72 and 1,240.68 is: 1,861.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.48 : 1,863.72 = 1,240.68 : x
  2. Step 2: Convert to fraction form
    1,242.48/1,863.72 = 1,240.68/x
  3. Step 3: Cross multiply
    1,242.48x = 1,863.72 × 1,240.68
  4. Step 4: Simplify right side
    1,242.48x = 2,312,280.13
  5. Step 5: Solve for x
    x = 2,312,280.13/1,242.48
  6. Step 6: Final answer
    x = 1,861.02

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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.