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Finding the Fourth Proportional to 79.07, 117.90 and 67.46

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Solution

The fourth proportional to 79.07, 117.90 and 67.46 is: 100.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.07 : 117.90 = 67.46 : x
  2. Step 2: Convert to fraction form
    79.07/117.90 = 67.46/x
  3. Step 3: Cross multiply
    79.07x = 117.90 × 67.46
  4. Step 4: Simplify right side
    79.07x = 7,952.94
  5. Step 5: Solve for x
    x = 7,952.94/79.07
  6. Step 6: Final answer
    x = 100.59

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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.