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Finding the Fourth Proportional to 980.55, 1,471.32 and 432.50

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Solution

The fourth proportional to 980.55, 1,471.32 and 432.50 is: 648.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.55 : 1,471.32 = 432.50 : x
  2. Step 2: Convert to fraction form
    980.55/1,471.32 = 432.50/x
  3. Step 3: Cross multiply
    980.55x = 1,471.32 × 432.50
  4. Step 4: Simplify right side
    980.55x = 636,338.54
  5. Step 5: Solve for x
    x = 636,338.54/980.55
  6. Step 6: Final answer
    x = 648.96

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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.