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Finding the Fourth Proportional to 267.07, 398.99 and 261.67

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Solution

The fourth proportional to 267.07, 398.99 and 261.67 is: 390.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.07 : 398.99 = 261.67 : x
  2. Step 2: Convert to fraction form
    267.07/398.99 = 261.67/x
  3. Step 3: Cross multiply
    267.07x = 398.99 × 261.67
  4. Step 4: Simplify right side
    267.07x = 104,403.71
  5. Step 5: Solve for x
    x = 104,403.71/267.07
  6. Step 6: Final answer
    x = 390.92

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.