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Finding the Fourth Proportional to 371.61, 512.87 and 309.33

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Solution

The fourth proportional to 371.61, 512.87 and 309.33 is: 426.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.61 : 512.87 = 309.33 : x
  2. Step 2: Convert to fraction form
    371.61/512.87 = 309.33/x
  3. Step 3: Cross multiply
    371.61x = 512.87 × 309.33
  4. Step 4: Simplify right side
    371.61x = 158,646.08
  5. Step 5: Solve for x
    x = 158,646.08/371.61
  6. Step 6: Final answer
    x = 426.92

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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.