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Finding the Fourth Proportional to 309, 426.40 and 169.12

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Solution

The fourth proportional to 309, 426.40 and 169.12 is: 233.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    309 : 426.40 = 169.12 : x
  2. Step 2: Convert to fraction form
    309/426.40 = 169.12/x
  3. Step 3: Cross multiply
    309x = 426.40 × 169.12
  4. Step 4: Simplify right side
    309x = 72,112.77
  5. Step 5: Solve for x
    x = 72,112.77/309
  6. Step 6: Final answer
    x = 233.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.