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Finding the Fourth Proportional to 253.12, 379.60 and 79.78

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Solution

The fourth proportional to 253.12, 379.60 and 79.78 is: 119.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.12 : 379.60 = 79.78 : x
  2. Step 2: Convert to fraction form
    253.12/379.60 = 79.78/x
  3. Step 3: Cross multiply
    253.12x = 379.60 × 79.78
  4. Step 4: Simplify right side
    253.12x = 30,284.49
  5. Step 5: Solve for x
    x = 30,284.49/253.12
  6. Step 6: Final answer
    x = 119.64

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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.