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Finding the Fourth Proportional to 621.30, 930.86 and 377.31

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Solution

The fourth proportional to 621.30, 930.86 and 377.31 is: 565.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.30 : 930.86 = 377.31 : x
  2. Step 2: Convert to fraction form
    621.30/930.86 = 377.31/x
  3. Step 3: Cross multiply
    621.30x = 930.86 × 377.31
  4. Step 4: Simplify right side
    621.30x = 351,222.79
  5. Step 5: Solve for x
    x = 351,222.79/621.30
  6. Step 6: Final answer
    x = 565.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.