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Finding the Fourth Proportional to 980.85, 1,471.29 and 432.92

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Solution

The fourth proportional to 980.85, 1,471.29 and 432.92 is: 649.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.85 : 1,471.29 = 432.92 : x
  2. Step 2: Convert to fraction form
    980.85/1,471.29 = 432.92/x
  3. Step 3: Cross multiply
    980.85x = 1,471.29 × 432.92
  4. Step 4: Simplify right side
    980.85x = 636,950.87
  5. Step 5: Solve for x
    x = 636,950.87/980.85
  6. Step 6: Final answer
    x = 649.39

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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.