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Finding the Fourth Proportional to 626.42, 864.11 and 486.32

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Solution

The fourth proportional to 626.42, 864.11 and 486.32 is: 670.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.42 : 864.11 = 486.32 : x
  2. Step 2: Convert to fraction form
    626.42/864.11 = 486.32/x
  3. Step 3: Cross multiply
    626.42x = 864.11 × 486.32
  4. Step 4: Simplify right side
    626.42x = 420,233.98
  5. Step 5: Solve for x
    x = 420,233.98/626.42
  6. Step 6: Final answer
    x = 670.85

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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.