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Finding the Fourth Proportional to 369.28, 553.38 and 261.28

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Solution

The fourth proportional to 369.28, 553.38 and 261.28 is: 391.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.28 : 553.38 = 261.28 : x
  2. Step 2: Convert to fraction form
    369.28/553.38 = 261.28/x
  3. Step 3: Cross multiply
    369.28x = 553.38 × 261.28
  4. Step 4: Simplify right side
    369.28x = 144,587.13
  5. Step 5: Solve for x
    x = 144,587.13/369.28
  6. Step 6: Final answer
    x = 391.54

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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.