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Finding the Fourth Proportional to 91.51, 136.94 and 72.09

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Solution

The fourth proportional to 91.51, 136.94 and 72.09 is: 107.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.51 : 136.94 = 72.09 : x
  2. Step 2: Convert to fraction form
    91.51/136.94 = 72.09/x
  3. Step 3: Cross multiply
    91.51x = 136.94 × 72.09
  4. Step 4: Simplify right side
    91.51x = 9,871.32
  5. Step 5: Solve for x
    x = 9,871.32/91.51
  6. Step 6: Final answer
    x = 107.88

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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.