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Finding the Fourth Proportional to 486.72, 670.92 and 408

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Solution

The fourth proportional to 486.72, 670.92 and 408 is: 562.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.72 : 670.92 = 408 : x
  2. Step 2: Convert to fraction form
    486.72/670.92 = 408/x
  3. Step 3: Cross multiply
    486.72x = 670.92 × 408
  4. Step 4: Simplify right side
    486.72x = 273,735.36
  5. Step 5: Solve for x
    x = 273,735.36/486.72
  6. Step 6: Final answer
    x = 562.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.