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Finding the Fourth Proportional to 101.28, 152 and 53.20

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Solution

The fourth proportional to 101.28, 152 and 53.20 is: 79.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.28 : 152 = 53.20 : x
  2. Step 2: Convert to fraction form
    101.28/152 = 53.20/x
  3. Step 3: Cross multiply
    101.28x = 152 × 53.20
  4. Step 4: Simplify right side
    101.28x = 8,086.40
  5. Step 5: Solve for x
    x = 8,086.40/101.28
  6. Step 6: Final answer
    x = 79.84

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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.