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Finding the Fourth Proportional to 284.12, 426.26 and 91.76

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Solution

The fourth proportional to 284.12, 426.26 and 91.76 is: 137.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.12 : 426.26 = 91.76 : x
  2. Step 2: Convert to fraction form
    284.12/426.26 = 91.76/x
  3. Step 3: Cross multiply
    284.12x = 426.26 × 91.76
  4. Step 4: Simplify right side
    284.12x = 39,113.62
  5. Step 5: Solve for x
    x = 39,113.62/284.12
  6. Step 6: Final answer
    x = 137.67

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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.