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Finding the Fourth Proportional to 668.28, 922.86 and 631.92

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Solution

The fourth proportional to 668.28, 922.86 and 631.92 is: 872.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.28 : 922.86 = 631.92 : x
  2. Step 2: Convert to fraction form
    668.28/922.86 = 631.92/x
  3. Step 3: Cross multiply
    668.28x = 922.86 × 631.92
  4. Step 4: Simplify right side
    668.28x = 583,173.69
  5. Step 5: Solve for x
    x = 583,173.69/668.28
  6. Step 6: Final answer
    x = 872.65

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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.