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Finding the Fourth Proportional to 54.57, 74.90 and 48.61

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Solution

The fourth proportional to 54.57, 74.90 and 48.61 is: 66.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.57 : 74.90 = 48.61 : x
  2. Step 2: Convert to fraction form
    54.57/74.90 = 48.61/x
  3. Step 3: Cross multiply
    54.57x = 74.90 × 48.61
  4. Step 4: Simplify right side
    54.57x = 3,641.10
  5. Step 5: Solve for x
    x = 3,641.10/54.57
  6. Step 6: Final answer
    x = 66.72

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.