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Finding the Fourth Proportional to 309.28, 463.44 and 138.08

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Solution

The fourth proportional to 309.28, 463.44 and 138.08 is: 206.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.28 : 463.44 = 138.08 : x
  2. Step 2: Convert to fraction form
    309.28/463.44 = 138.08/x
  3. Step 3: Cross multiply
    309.28x = 463.44 × 138.08
  4. Step 4: Simplify right side
    309.28x = 63,991.80
  5. Step 5: Solve for x
    x = 63,991.80/309.28
  6. Step 6: Final answer
    x = 206.91

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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.