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Finding the Fourth Proportional to 309.08, 426.08 and 215.69

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Solution

The fourth proportional to 309.08, 426.08 and 215.69 is: 297.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.08 : 426.08 = 215.69 : x
  2. Step 2: Convert to fraction form
    309.08/426.08 = 215.69/x
  3. Step 3: Cross multiply
    309.08x = 426.08 × 215.69
  4. Step 4: Simplify right side
    309.08x = 91,899.60
  5. Step 5: Solve for x
    x = 91,899.60/309.08
  6. Step 6: Final answer
    x = 297.33

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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.