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Finding the Fourth Proportional to 75.80, 113.92 and 55.56

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Solution

The fourth proportional to 75.80, 113.92 and 55.56 is: 83.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.80 : 113.92 = 55.56 : x
  2. Step 2: Convert to fraction form
    75.80/113.92 = 55.56/x
  3. Step 3: Cross multiply
    75.80x = 113.92 × 55.56
  4. Step 4: Simplify right side
    75.80x = 6,329.40
  5. Step 5: Solve for x
    x = 6,329.40/75.80
  6. Step 6: Final answer
    x = 83.50

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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.