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Finding the Fourth Proportional to 368.30, 552.20 and 137.15

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Solution

The fourth proportional to 368.30, 552.20 and 137.15 is: 205.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.30 : 552.20 = 137.15 : x
  2. Step 2: Convert to fraction form
    368.30/552.20 = 137.15/x
  3. Step 3: Cross multiply
    368.30x = 552.20 × 137.15
  4. Step 4: Simplify right side
    368.30x = 75,731.81
  5. Step 5: Solve for x
    x = 75,731.81/368.30
  6. Step 6: Final answer
    x = 205.63

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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.