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Finding the Fourth Proportional to 980.72, 1,351.85 and 743.72

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Solution

The fourth proportional to 980.72, 1,351.85 and 743.72 is: 1,025.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.72 : 1,351.85 = 743.72 : x
  2. Step 2: Convert to fraction form
    980.72/1,351.85 = 743.72/x
  3. Step 3: Cross multiply
    980.72x = 1,351.85 × 743.72
  4. Step 4: Simplify right side
    980.72x = 1,005,387.40
  5. Step 5: Solve for x
    x = 1,005,387.40/980.72
  6. Step 6: Final answer
    x = 1,025.15

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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.