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Finding the Fourth Proportional to 621.85, 858.24 and 356.37

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Solution

The fourth proportional to 621.85, 858.24 and 356.37 is: 491.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.85 : 858.24 = 356.37 : x
  2. Step 2: Convert to fraction form
    621.85/858.24 = 356.37/x
  3. Step 3: Cross multiply
    621.85x = 858.24 × 356.37
  4. Step 4: Simplify right side
    621.85x = 305,856.01
  5. Step 5: Solve for x
    x = 305,856.01/621.85
  6. Step 6: Final answer
    x = 491.85

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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.