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Finding the Fourth Proportional to 54.16, 81.15 and 31.26

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Solution

The fourth proportional to 54.16, 81.15 and 31.26 is: 46.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.16 : 81.15 = 31.26 : x
  2. Step 2: Convert to fraction form
    54.16/81.15 = 31.26/x
  3. Step 3: Cross multiply
    54.16x = 81.15 × 31.26
  4. Step 4: Simplify right side
    54.16x = 2,536.75
  5. Step 5: Solve for x
    x = 2,536.75/54.16
  6. Step 6: Final answer
    x = 46.84

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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.