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Finding the Fourth Proportional to 240.40, 360.78 and 137.68

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Solution

The fourth proportional to 240.40, 360.78 and 137.68 is: 206.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    240.40 : 360.78 = 137.68 : x
  2. Step 2: Convert to fraction form
    240.40/360.78 = 137.68/x
  3. Step 3: Cross multiply
    240.40x = 360.78 × 137.68
  4. Step 4: Simplify right side
    240.40x = 49,672.19
  5. Step 5: Solve for x
    x = 49,672.19/240.40
  6. Step 6: Final answer
    x = 206.62

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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.