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Finding the Fourth Proportional to 409, 613.26 and 361

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Solution

The fourth proportional to 409, 613.26 and 361 is: 541.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    409 : 613.26 = 361 : x
  2. Step 2: Convert to fraction form
    409/613.26 = 361/x
  3. Step 3: Cross multiply
    409x = 613.26 × 361
  4. Step 4: Simplify right side
    409x = 221,386.86
  5. Step 5: Solve for x
    x = 221,386.86/409
  6. Step 6: Final answer
    x = 541.29

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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.