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Finding the Fourth Proportional to 101.46, 139.86 and 79.59

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Solution

The fourth proportional to 101.46, 139.86 and 79.59 is: 109.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.46 : 139.86 = 79.59 : x
  2. Step 2: Convert to fraction form
    101.46/139.86 = 79.59/x
  3. Step 3: Cross multiply
    101.46x = 139.86 × 79.59
  4. Step 4: Simplify right side
    101.46x = 11,131.46
  5. Step 5: Solve for x
    x = 11,131.46/101.46
  6. Step 6: Final answer
    x = 109.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.