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Finding the Fourth Proportional to 980.99, 1,471.86 and 432.78

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Solution

The fourth proportional to 980.99, 1,471.86 and 432.78 is: 649.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.99 : 1,471.86 = 432.78 : x
  2. Step 2: Convert to fraction form
    980.99/1,471.86 = 432.78/x
  3. Step 3: Cross multiply
    980.99x = 1,471.86 × 432.78
  4. Step 4: Simplify right side
    980.99x = 636,991.57
  5. Step 5: Solve for x
    x = 636,991.57/980.99
  6. Step 6: Final answer
    x = 649.34

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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.