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Finding the Fourth Proportional to 1,243.68, 1,715.76 and 980.64

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Solution

The fourth proportional to 1,243.68, 1,715.76 and 980.64 is: 1,352.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.68 : 1,715.76 = 980.64 : x
  2. Step 2: Convert to fraction form
    1,243.68/1,715.76 = 980.64/x
  3. Step 3: Cross multiply
    1,243.68x = 1,715.76 × 980.64
  4. Step 4: Simplify right side
    1,243.68x = 1,682,542.89
  5. Step 5: Solve for x
    x = 1,682,542.89/1,243.68
  6. Step 6: Final answer
    x = 1,352.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.