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Finding the Fourth Proportional to 54.84, 81.89 and 47.15

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Solution

The fourth proportional to 54.84, 81.89 and 47.15 is: 70.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.84 : 81.89 = 47.15 : x
  2. Step 2: Convert to fraction form
    54.84/81.89 = 47.15/x
  3. Step 3: Cross multiply
    54.84x = 81.89 × 47.15
  4. Step 4: Simplify right side
    54.84x = 3,861.22
  5. Step 5: Solve for x
    x = 3,861.22/54.84
  6. Step 6: Final answer
    x = 70.41

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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.