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Finding the Fourth Proportional to 199.40, 299.30 and 127.31

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Solution

The fourth proportional to 199.40, 299.30 and 127.31 is: 191.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.40 : 299.30 = 127.31 : x
  2. Step 2: Convert to fraction form
    199.40/299.30 = 127.31/x
  3. Step 3: Cross multiply
    199.40x = 299.30 × 127.31
  4. Step 4: Simplify right side
    199.40x = 38,101.75
  5. Step 5: Solve for x
    x = 38,101.75/199.40
  6. Step 6: Final answer
    x = 191.09

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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.