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Finding the Fourth Proportional to 71.33, 106.88 and 53.28

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Solution

The fourth proportional to 71.33, 106.88 and 53.28 is: 79.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.33 : 106.88 = 53.28 : x
  2. Step 2: Convert to fraction form
    71.33/106.88 = 53.28/x
  3. Step 3: Cross multiply
    71.33x = 106.88 × 53.28
  4. Step 4: Simplify right side
    71.33x = 5,694.70
  5. Step 5: Solve for x
    x = 5,694.70/71.33
  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.