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Finding the Fourth Proportional to 253.20, 379.76 and 79.84

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Solution

The fourth proportional to 253.20, 379.76 and 79.84 is: 119.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.20 : 379.76 = 79.84 : x
  2. Step 2: Convert to fraction form
    253.20/379.76 = 79.84/x
  3. Step 3: Cross multiply
    253.20x = 379.76 × 79.84
  4. Step 4: Simplify right side
    253.20x = 30,320.11
  5. Step 5: Solve for x
    x = 30,320.11/253.20
  6. Step 6: Final answer
    x = 119.75

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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.