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Finding the Fourth Proportional to 621.44, 930.08 and 485.12

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Solution

The fourth proportional to 621.44, 930.08 and 485.12 is: 726.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.44 : 930.08 = 485.12 : x
  2. Step 2: Convert to fraction form
    621.44/930.08 = 485.12/x
  3. Step 3: Cross multiply
    621.44x = 930.08 × 485.12
  4. Step 4: Simplify right side
    621.44x = 451,200.41
  5. Step 5: Solve for x
    x = 451,200.41/621.44
  6. Step 6: Final answer
    x = 726.06

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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.