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Finding the Fourth Proportional to 368.78, 553.37 and 247.28

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Solution

The fourth proportional to 368.78, 553.37 and 247.28 is: 371.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.78 : 553.37 = 247.28 : x
  2. Step 2: Convert to fraction form
    368.78/553.37 = 247.28/x
  3. Step 3: Cross multiply
    368.78x = 553.37 × 247.28
  4. Step 4: Simplify right side
    368.78x = 136,833.33
  5. Step 5: Solve for x
    x = 136,833.33/368.78
  6. Step 6: Final answer
    x = 371.05

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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.