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Finding the Fourth Proportional to 668.72, 921.44 and 568.79

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Solution

The fourth proportional to 668.72, 921.44 and 568.79 is: 783.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.72 : 921.44 = 568.79 : x
  2. Step 2: Convert to fraction form
    668.72/921.44 = 568.79/x
  3. Step 3: Cross multiply
    668.72x = 921.44 × 568.79
  4. Step 4: Simplify right side
    668.72x = 524,098.41
  5. Step 5: Solve for x
    x = 524,098.41/668.72
  6. Step 6: Final answer
    x = 783.74

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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.