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Finding the Fourth Proportional to 668.56, 921.06 and 551.92

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Solution

The fourth proportional to 668.56, 921.06 and 551.92 is: 760.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.56 : 921.06 = 551.92 : x
  2. Step 2: Convert to fraction form
    668.56/921.06 = 551.92/x
  3. Step 3: Cross multiply
    668.56x = 921.06 × 551.92
  4. Step 4: Simplify right side
    668.56x = 508,351.44
  5. Step 5: Solve for x
    x = 508,351.44/668.56
  6. Step 6: Final answer
    x = 760.37

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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.