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Finding the Fourth Proportional to 825.74, 1,234.92 and 620.45

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Solution

The fourth proportional to 825.74, 1,234.92 and 620.45 is: 927.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.74 : 1,234.92 = 620.45 : x
  2. Step 2: Convert to fraction form
    825.74/1,234.92 = 620.45/x
  3. Step 3: Cross multiply
    825.74x = 1,234.92 × 620.45
  4. Step 4: Simplify right side
    825.74x = 766,206.11
  5. Step 5: Solve for x
    x = 766,206.11/825.74
  6. Step 6: Final answer
    x = 927.90

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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.