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Finding the Fourth Proportional to 91.74, 137.69 and 91.07

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Solution

The fourth proportional to 91.74, 137.69 and 91.07 is: 136.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.74 : 137.69 = 91.07 : x
  2. Step 2: Convert to fraction form
    91.74/137.69 = 91.07/x
  3. Step 3: Cross multiply
    91.74x = 137.69 × 91.07
  4. Step 4: Simplify right side
    91.74x = 12,539.43
  5. Step 5: Solve for x
    x = 12,539.43/91.74
  6. Step 6: Final answer
    x = 136.68

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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.