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Finding the Fourth Proportional to 262, 393.08 and 79.39

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Solution

The fourth proportional to 262, 393.08 and 79.39 is: 119.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    262 : 393.08 = 79.39 : x
  2. Step 2: Convert to fraction form
    262/393.08 = 79.39/x
  3. Step 3: Cross multiply
    262x = 393.08 × 79.39
  4. Step 4: Simplify right side
    262x = 31,206.62
  5. Step 5: Solve for x
    x = 31,206.62/262
  6. Step 6: Final answer
    x = 119.11

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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.