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Finding the Fourth Proportional to 91.69, 137.57 and 84.20

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Solution

The fourth proportional to 91.69, 137.57 and 84.20 is: 126.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.69 : 137.57 = 84.20 : x
  2. Step 2: Convert to fraction form
    91.69/137.57 = 84.20/x
  3. Step 3: Cross multiply
    91.69x = 137.57 × 84.20
  4. Step 4: Simplify right side
    91.69x = 11,582.29
  5. Step 5: Solve for x
    x = 11,582.29/91.69
  6. Step 6: Final answer
    x = 126.32

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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.