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Finding the Fourth Proportional to 53.80, 80.05 and 53.62

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Solution

The fourth proportional to 53.80, 80.05 and 53.62 is: 79.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.80 : 80.05 = 53.62 : x
  2. Step 2: Convert to fraction form
    53.80/80.05 = 53.62/x
  3. Step 3: Cross multiply
    53.80x = 80.05 × 53.62
  4. Step 4: Simplify right side
    53.80x = 4,292.01
  5. Step 5: Solve for x
    x = 4,292.01/53.80
  6. Step 6: Final answer
    x = 79.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.