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Finding the Fourth Proportional to 80.48, 120.63 and 57.70

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Solution

The fourth proportional to 80.48, 120.63 and 57.70 is: 86.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.48 : 120.63 = 57.70 : x
  2. Step 2: Convert to fraction form
    80.48/120.63 = 57.70/x
  3. Step 3: Cross multiply
    80.48x = 120.63 × 57.70
  4. Step 4: Simplify right side
    80.48x = 6,960.35
  5. Step 5: Solve for x
    x = 6,960.35/80.48
  6. Step 6: Final answer
    x = 86.49

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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.