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Finding the Fourth Proportional to 409.72, 613.36 and 247.72

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Solution

The fourth proportional to 409.72, 613.36 and 247.72 is: 370.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.72 : 613.36 = 247.72 : x
  2. Step 2: Convert to fraction form
    409.72/613.36 = 247.72/x
  3. Step 3: Cross multiply
    409.72x = 613.36 × 247.72
  4. Step 4: Simplify right side
    409.72x = 151,941.54
  5. Step 5: Solve for x
    x = 151,941.54/409.72
  6. Step 6: Final answer
    x = 370.84

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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.