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Finding the Fourth Proportional to 79.74, 120.15 and 77.04

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Solution

The fourth proportional to 79.74, 120.15 and 77.04 is: 116.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.74 : 120.15 = 77.04 : x
  2. Step 2: Convert to fraction form
    79.74/120.15 = 77.04/x
  3. Step 3: Cross multiply
    79.74x = 120.15 × 77.04
  4. Step 4: Simplify right side
    79.74x = 9,256.36
  5. Step 5: Solve for x
    x = 9,256.36/79.74
  6. Step 6: Final answer
    x = 116.08

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.