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Finding the Fourth Proportional to 300.50, 450.65 and 138.10

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Solution

The fourth proportional to 300.50, 450.65 and 138.10 is: 207.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.50 : 450.65 = 138.10 : x
  2. Step 2: Convert to fraction form
    300.50/450.65 = 138.10/x
  3. Step 3: Cross multiply
    300.50x = 450.65 × 138.10
  4. Step 4: Simplify right side
    300.50x = 62,233.98
  5. Step 5: Solve for x
    x = 62,233.98/300.50
  6. Step 6: Final answer
    x = 207.10

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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.