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Finding the Fourth Proportional to 91.51, 137.73 and 68.80

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Solution

The fourth proportional to 91.51, 137.73 and 68.80 is: 103.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.51 : 137.73 = 68.80 : x
  2. Step 2: Convert to fraction form
    91.51/137.73 = 68.80/x
  3. Step 3: Cross multiply
    91.51x = 137.73 × 68.80
  4. Step 4: Simplify right side
    91.51x = 9,475.82
  5. Step 5: Solve for x
    x = 9,475.82/91.51
  6. Step 6: Final answer
    x = 103.55

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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.