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Finding the Fourth Proportional to 79.60, 118.98 and 77.68

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Solution

The fourth proportional to 79.60, 118.98 and 77.68 is: 116.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.60 : 118.98 = 77.68 : x
  2. Step 2: Convert to fraction form
    79.60/118.98 = 77.68/x
  3. Step 3: Cross multiply
    79.60x = 118.98 × 77.68
  4. Step 4: Simplify right side
    79.60x = 9,242.37
  5. Step 5: Solve for x
    x = 9,242.37/79.60
  6. Step 6: Final answer
    x = 116.11

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.