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Finding the Fourth Proportional to 79, 109.11 and 53.08

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Solution

The fourth proportional to 79, 109.11 and 53.08 is: 73.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    79 : 109.11 = 53.08 : x
  2. Step 2: Convert to fraction form
    79/109.11 = 53.08/x
  3. Step 3: Cross multiply
    79x = 109.11 × 53.08
  4. Step 4: Simplify right side
    79x = 5,791.56
  5. Step 5: Solve for x
    x = 5,791.56/79
  6. Step 6: Final answer
    x = 73.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.