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Finding the Fourth Proportional to 79.66, 118.85 and 69.40

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Solution

The fourth proportional to 79.66, 118.85 and 69.40 is: 103.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.66 : 118.85 = 69.40 : x
  2. Step 2: Convert to fraction form
    79.66/118.85 = 69.40/x
  3. Step 3: Cross multiply
    79.66x = 118.85 × 69.40
  4. Step 4: Simplify right side
    79.66x = 8,248.19
  5. Step 5: Solve for x
    x = 8,248.19/79.66
  6. Step 6: Final answer
    x = 103.54

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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.