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Finding the Fourth Proportional to 369.90, 553.56 and 261.49

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Solution

The fourth proportional to 369.90, 553.56 and 261.49 is: 391.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.90 : 553.56 = 261.49 : x
  2. Step 2: Convert to fraction form
    369.90/553.56 = 261.49/x
  3. Step 3: Cross multiply
    369.90x = 553.56 × 261.49
  4. Step 4: Simplify right side
    369.90x = 144,749.10
  5. Step 5: Solve for x
    x = 144,749.10/369.90
  6. Step 6: Final answer
    x = 391.32

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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.