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Finding the Fourth Proportional to 79.17, 118.78 and 40.64

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Solution

The fourth proportional to 79.17, 118.78 and 40.64 is: 60.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.17 : 118.78 = 40.64 : x
  2. Step 2: Convert to fraction form
    79.17/118.78 = 40.64/x
  3. Step 3: Cross multiply
    79.17x = 118.78 × 40.64
  4. Step 4: Simplify right side
    79.17x = 4,827.22
  5. Step 5: Solve for x
    x = 4,827.22/79.17
  6. Step 6: Final answer
    x = 60.97

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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.