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Finding the Fourth Proportional to 53.98, 81 and 38.79

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Solution

The fourth proportional to 53.98, 81 and 38.79 is: 58.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.98 : 81 = 38.79 : x
  2. Step 2: Convert to fraction form
    53.98/81 = 38.79/x
  3. Step 3: Cross multiply
    53.98x = 81 × 38.79
  4. Step 4: Simplify right side
    53.98x = 3,141.99
  5. Step 5: Solve for x
    x = 3,141.99/53.98
  6. Step 6: Final answer
    x = 58.21

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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.