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Finding the Fourth Proportional to 621.89, 858.16 and 356.31

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Solution

The fourth proportional to 621.89, 858.16 and 356.31 is: 491.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.89 : 858.16 = 356.31 : x
  2. Step 2: Convert to fraction form
    621.89/858.16 = 356.31/x
  3. Step 3: Cross multiply
    621.89x = 858.16 × 356.31
  4. Step 4: Simplify right side
    621.89x = 305,770.10
  5. Step 5: Solve for x
    x = 305,770.10/621.89
  6. Step 6: Final answer
    x = 491.68

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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.