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Finding the Fourth Proportional to 668.72, 927.11 and 631.87

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Solution

The fourth proportional to 668.72, 927.11 and 631.87 is: 876.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.72 : 927.11 = 631.87 : x
  2. Step 2: Convert to fraction form
    668.72/927.11 = 631.87/x
  3. Step 3: Cross multiply
    668.72x = 927.11 × 631.87
  4. Step 4: Simplify right side
    668.72x = 585,808.36
  5. Step 5: Solve for x
    x = 585,808.36/668.72
  6. Step 6: Final answer
    x = 876.01

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.