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Finding the Fourth Proportional to 687.35, 948.11 and 451.31

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Solution

The fourth proportional to 687.35, 948.11 and 451.31 is: 622.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.35 : 948.11 = 451.31 : x
  2. Step 2: Convert to fraction form
    687.35/948.11 = 451.31/x
  3. Step 3: Cross multiply
    687.35x = 948.11 × 451.31
  4. Step 4: Simplify right side
    687.35x = 427,889.27
  5. Step 5: Solve for x
    x = 427,889.27/687.35
  6. Step 6: Final answer
    x = 622.52

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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.