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Finding the Fourth Proportional to 54.91, 75.78 and 30.35

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Solution

The fourth proportional to 54.91, 75.78 and 30.35 is: 41.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.91 : 75.78 = 30.35 : x
  2. Step 2: Convert to fraction form
    54.91/75.78 = 30.35/x
  3. Step 3: Cross multiply
    54.91x = 75.78 × 30.35
  4. Step 4: Simplify right side
    54.91x = 2,299.94
  5. Step 5: Solve for x
    x = 2,299.94/54.91
  6. Step 6: Final answer
    x = 41.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.