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Finding the Fourth Proportional to 309.38, 463.80 and 138.50

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Solution

The fourth proportional to 309.38, 463.80 and 138.50 is: 207.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.38 : 463.80 = 138.50 : x
  2. Step 2: Convert to fraction form
    309.38/463.80 = 138.50/x
  3. Step 3: Cross multiply
    309.38x = 463.80 × 138.50
  4. Step 4: Simplify right side
    309.38x = 64,236.30
  5. Step 5: Solve for x
    x = 64,236.30/309.38
  6. Step 6: Final answer
    x = 207.63

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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.