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Finding the Fourth Proportional to 268, 402.16 and 139.76

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Solution

The fourth proportional to 268, 402.16 and 139.76 is: 209.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    268 : 402.16 = 139.76 : x
  2. Step 2: Convert to fraction form
    268/402.16 = 139.76/x
  3. Step 3: Cross multiply
    268x = 402.16 × 139.76
  4. Step 4: Simplify right side
    268x = 56,205.88
  5. Step 5: Solve for x
    x = 56,205.88/268
  6. Step 6: Final answer
    x = 209.72

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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.