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Finding the Fourth Proportional to 1,242.36, 1,861.12 and 980.96

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Solution

The fourth proportional to 1,242.36, 1,861.12 and 980.96 is: 1,469.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.36 : 1,861.12 = 980.96 : x
  2. Step 2: Convert to fraction form
    1,242.36/1,861.12 = 980.96/x
  3. Step 3: Cross multiply
    1,242.36x = 1,861.12 × 980.96
  4. Step 4: Simplify right side
    1,242.36x = 1,825,684.28
  5. Step 5: Solve for x
    x = 1,825,684.28/1,242.36
  6. Step 6: Final answer
    x = 1,469.53

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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.