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Finding the Fourth Proportional to 668.12, 921.36 and 482.80

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Solution

The fourth proportional to 668.12, 921.36 and 482.80 is: 665.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.12 : 921.36 = 482.80 : x
  2. Step 2: Convert to fraction form
    668.12/921.36 = 482.80/x
  3. Step 3: Cross multiply
    668.12x = 921.36 × 482.80
  4. Step 4: Simplify right side
    668.12x = 444,832.61
  5. Step 5: Solve for x
    x = 444,832.61/668.12
  6. Step 6: Final answer
    x = 665.80

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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.