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Finding the Fourth Proportional to 54.65, 81.90 and 34.29

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Solution

The fourth proportional to 54.65, 81.90 and 34.29 is: 51.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.65 : 81.90 = 34.29 : x
  2. Step 2: Convert to fraction form
    54.65/81.90 = 34.29/x
  3. Step 3: Cross multiply
    54.65x = 81.90 × 34.29
  4. Step 4: Simplify right side
    54.65x = 2,808.35
  5. Step 5: Solve for x
    x = 2,808.35/54.65
  6. Step 6: Final answer
    x = 51.39

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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.