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Finding the Fourth Proportional to 220, 330.15 and 91.75

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Solution

The fourth proportional to 220, 330.15 and 91.75 is: 137.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    220 : 330.15 = 91.75 : x
  2. Step 2: Convert to fraction form
    220/330.15 = 91.75/x
  3. Step 3: Cross multiply
    220x = 330.15 × 91.75
  4. Step 4: Simplify right side
    220x = 30,291.26
  5. Step 5: Solve for x
    x = 30,291.26/220
  6. Step 6: Final answer
    x = 137.69

Related Problems

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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.