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Finding the Fourth Proportional to 101.28, 139.78 and 59.84

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Solution

The fourth proportional to 101.28, 139.78 and 59.84 is: 82.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.28 : 139.78 = 59.84 : x
  2. Step 2: Convert to fraction form
    101.28/139.78 = 59.84/x
  3. Step 3: Cross multiply
    101.28x = 139.78 × 59.84
  4. Step 4: Simplify right side
    101.28x = 8,364.00
  5. Step 5: Solve for x
    x = 8,364.00/101.28
  6. Step 6: Final answer
    x = 82.58

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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.