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Finding the Fourth Proportional to 199.79, 299.15 and 103.40

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Solution

The fourth proportional to 199.79, 299.15 and 103.40 is: 154.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.79 : 299.15 = 103.40 : x
  2. Step 2: Convert to fraction form
    199.79/299.15 = 103.40/x
  3. Step 3: Cross multiply
    199.79x = 299.15 × 103.40
  4. Step 4: Simplify right side
    199.79x = 30,931.59
  5. Step 5: Solve for x
    x = 30,931.59/199.79
  6. Step 6: Final answer
    x = 154.82

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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.