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Finding the Fourth Proportional to 980.32, 1,469.28 and 460

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Solution

The fourth proportional to 980.32, 1,469.28 and 460 is: 689.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.32 : 1,469.28 = 460 : x
  2. Step 2: Convert to fraction form
    980.32/1,469.28 = 460/x
  3. Step 3: Cross multiply
    980.32x = 1,469.28 × 460
  4. Step 4: Simplify right side
    980.32x = 675,868.80
  5. Step 5: Solve for x
    x = 675,868.80/980.32
  6. Step 6: Final answer
    x = 689.44

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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.