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Finding the Fourth Proportional to 267.71, 401.53 and 85.12

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Solution

The fourth proportional to 267.71, 401.53 and 85.12 is: 127.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.71 : 401.53 = 85.12 : x
  2. Step 2: Convert to fraction form
    267.71/401.53 = 85.12/x
  3. Step 3: Cross multiply
    267.71x = 401.53 × 85.12
  4. Step 4: Simplify right side
    267.71x = 34,177.81
  5. Step 5: Solve for x
    x = 34,177.81/267.71
  6. Step 6: Final answer
    x = 127.67

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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.