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Finding the Fourth Proportional to 91.94, 137.79 and 53.42

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Solution

The fourth proportional to 91.94, 137.79 and 53.42 is: 80.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.94 : 137.79 = 53.42 : x
  2. Step 2: Convert to fraction form
    91.94/137.79 = 53.42/x
  3. Step 3: Cross multiply
    91.94x = 137.79 × 53.42
  4. Step 4: Simplify right side
    91.94x = 7,360.05
  5. Step 5: Solve for x
    x = 7,360.05/91.94
  6. Step 6: Final answer
    x = 80.06

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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.