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Finding the Fourth Proportional to 668.36, 921.89 and 406.53

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Solution

The fourth proportional to 668.36, 921.89 and 406.53 is: 560.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.36 : 921.89 = 406.53 : x
  2. Step 2: Convert to fraction form
    668.36/921.89 = 406.53/x
  3. Step 3: Cross multiply
    668.36x = 921.89 × 406.53
  4. Step 4: Simplify right side
    668.36x = 374,773.91
  5. Step 5: Solve for x
    x = 374,773.91/668.36
  6. Step 6: Final answer
    x = 560.74

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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.