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Finding the Fourth Proportional to 38.80, 52.80 and 38.80

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Solution

The fourth proportional to 38.80, 52.80 and 38.80 is: 52.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.80 : 52.80 = 38.80 : x
  2. Step 2: Convert to fraction form
    38.80/52.80 = 38.80/x
  3. Step 3: Cross multiply
    38.80x = 52.80 × 38.80
  4. Step 4: Simplify right side
    38.80x = 2,048.64
  5. Step 5: Solve for x
    x = 2,048.64/38.80
  6. Step 6: Final answer
    x = 52.80

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.