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Finding the Fourth Proportional to 621.98, 858.16 and 400.85

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Solution

The fourth proportional to 621.98, 858.16 and 400.85 is: 553.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.98 : 858.16 = 400.85 : x
  2. Step 2: Convert to fraction form
    621.98/858.16 = 400.85/x
  3. Step 3: Cross multiply
    621.98x = 858.16 × 400.85
  4. Step 4: Simplify right side
    621.98x = 343,993.44
  5. Step 5: Solve for x
    x = 343,993.44/621.98
  6. Step 6: Final answer
    x = 553.06

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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.