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Finding the Fourth Proportional to 980.47, 1,471.11 and 518.77

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Solution

The fourth proportional to 980.47, 1,471.11 and 518.77 is: 778.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.47 : 1,471.11 = 518.77 : x
  2. Step 2: Convert to fraction form
    980.47/1,471.11 = 518.77/x
  3. Step 3: Cross multiply
    980.47x = 1,471.11 × 518.77
  4. Step 4: Simplify right side
    980.47x = 763,167.73
  5. Step 5: Solve for x
    x = 763,167.73/980.47
  6. Step 6: Final answer
    x = 778.37

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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.