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Finding the Fourth Proportional to 199.40, 299.10 and 130.92

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Solution

The fourth proportional to 199.40, 299.10 and 130.92 is: 196.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.40 : 299.10 = 130.92 : x
  2. Step 2: Convert to fraction form
    199.40/299.10 = 130.92/x
  3. Step 3: Cross multiply
    199.40x = 299.10 × 130.92
  4. Step 4: Simplify right side
    199.40x = 39,158.17
  5. Step 5: Solve for x
    x = 39,158.17/199.40
  6. Step 6: Final answer
    x = 196.38

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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.