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Finding the Fourth Proportional to 621.56, 858.12 and 482

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Solution

The fourth proportional to 621.56, 858.12 and 482 is: 665.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.56 : 858.12 = 482 : x
  2. Step 2: Convert to fraction form
    621.56/858.12 = 482/x
  3. Step 3: Cross multiply
    621.56x = 858.12 × 482
  4. Step 4: Simplify right side
    621.56x = 413,613.84
  5. Step 5: Solve for x
    x = 413,613.84/621.56
  6. Step 6: Final answer
    x = 665.44

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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.