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Finding the Fourth Proportional to 54.16, 81.20 and 49.70

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Solution

The fourth proportional to 54.16, 81.20 and 49.70 is: 74.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.16 : 81.20 = 49.70 : x
  2. Step 2: Convert to fraction form
    54.16/81.20 = 49.70/x
  3. Step 3: Cross multiply
    54.16x = 81.20 × 49.70
  4. Step 4: Simplify right side
    54.16x = 4,035.64
  5. Step 5: Solve for x
    x = 4,035.64/54.16
  6. Step 6: Final answer
    x = 74.51

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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.