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Finding the Fourth Proportional to 358.11, 537.20 and 138.74

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Solution

The fourth proportional to 358.11, 537.20 and 138.74 is: 208.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.11 : 537.20 = 138.74 : x
  2. Step 2: Convert to fraction form
    358.11/537.20 = 138.74/x
  3. Step 3: Cross multiply
    358.11x = 537.20 × 138.74
  4. Step 4: Simplify right side
    358.11x = 74,527.75
  5. Step 5: Solve for x
    x = 74,527.75/358.11
  6. Step 6: Final answer
    x = 208.11

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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.