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Finding the Fourth Proportional to 53.11, 79.94 and 39.75

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Solution

The fourth proportional to 53.11, 79.94 and 39.75 is: 59.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.11 : 79.94 = 39.75 : x
  2. Step 2: Convert to fraction form
    53.11/79.94 = 39.75/x
  3. Step 3: Cross multiply
    53.11x = 79.94 × 39.75
  4. Step 4: Simplify right side
    53.11x = 3,177.62
  5. Step 5: Solve for x
    x = 3,177.62/53.11
  6. Step 6: Final answer
    x = 59.83

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.