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Finding the Fourth Proportional to 80.43, 120.64 and 39.83

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Solution

The fourth proportional to 80.43, 120.64 and 39.83 is: 59.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.43 : 120.64 = 39.83 : x
  2. Step 2: Convert to fraction form
    80.43/120.64 = 39.83/x
  3. Step 3: Cross multiply
    80.43x = 120.64 × 39.83
  4. Step 4: Simplify right side
    80.43x = 4,804.46
  5. Step 5: Solve for x
    x = 4,804.46/80.43
  6. Step 6: Final answer
    x = 59.74

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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.