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Finding the Fourth Proportional to 268.42, 402.59 and 76

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Solution

The fourth proportional to 268.42, 402.59 and 76 is: 113.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.42 : 402.59 = 76 : x
  2. Step 2: Convert to fraction form
    268.42/402.59 = 76/x
  3. Step 3: Cross multiply
    268.42x = 402.59 × 76
  4. Step 4: Simplify right side
    268.42x = 30,596.46
  5. Step 5: Solve for x
    x = 30,596.46/268.42
  6. Step 6: Final answer
    x = 113.99

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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.