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Finding the Fourth Proportional to 253.00, 379.55 and 79.69

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Solution

The fourth proportional to 253.00, 379.55 and 79.69 is: 119.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.00 : 379.55 = 79.69 : x
  2. Step 2: Convert to fraction form
    253.00/379.55 = 79.69/x
  3. Step 3: Cross multiply
    253.00x = 379.55 × 79.69
  4. Step 4: Simplify right side
    253.00x = 30,247.50
  5. Step 5: Solve for x
    x = 30,247.50/253.00
  6. Step 6: Final answer
    x = 119.56

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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.