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Finding the Fourth Proportional to 120.79, 181.49 and 77.48

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Solution

The fourth proportional to 120.79, 181.49 and 77.48 is: 116.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.79 : 181.49 = 77.48 : x
  2. Step 2: Convert to fraction form
    120.79/181.49 = 77.48/x
  3. Step 3: Cross multiply
    120.79x = 181.49 × 77.48
  4. Step 4: Simplify right side
    120.79x = 14,061.45
  5. Step 5: Solve for x
    x = 14,061.45/120.79
  6. Step 6: Final answer
    x = 116.41

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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.