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Finding the Fourth Proportional to 75.74, 113.14 and 55.46

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Solution

The fourth proportional to 75.74, 113.14 and 55.46 is: 82.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.74 : 113.14 = 55.46 : x
  2. Step 2: Convert to fraction form
    75.74/113.14 = 55.46/x
  3. Step 3: Cross multiply
    75.74x = 113.14 × 55.46
  4. Step 4: Simplify right side
    75.74x = 6,274.74
  5. Step 5: Solve for x
    x = 6,274.74/75.74
  6. Step 6: Final answer
    x = 82.85

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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.