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Finding the Fourth Proportional to 54.24, 81.40 and 42.84

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Solution

The fourth proportional to 54.24, 81.40 and 42.84 is: 64.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.24 : 81.40 = 42.84 : x
  2. Step 2: Convert to fraction form
    54.24/81.40 = 42.84/x
  3. Step 3: Cross multiply
    54.24x = 81.40 × 42.84
  4. Step 4: Simplify right side
    54.24x = 3,487.18
  5. Step 5: Solve for x
    x = 3,487.18/54.24
  6. Step 6: Final answer
    x = 64.29

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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.