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Finding the Fourth Proportional to 91.21, 136.83 and 43.12

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Solution

The fourth proportional to 91.21, 136.83 and 43.12 is: 64.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.21 : 136.83 = 43.12 : x
  2. Step 2: Convert to fraction form
    91.21/136.83 = 43.12/x
  3. Step 3: Cross multiply
    91.21x = 136.83 × 43.12
  4. Step 4: Simplify right side
    91.21x = 5,900.11
  5. Step 5: Solve for x
    x = 5,900.11/91.21
  6. Step 6: Final answer
    x = 64.69

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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.