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Finding the Fourth Proportional to 1,331.51, 1,996.92 and 509.83

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Solution

The fourth proportional to 1,331.51, 1,996.92 and 509.83 is: 764.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.51 : 1,996.92 = 509.83 : x
  2. Step 2: Convert to fraction form
    1,331.51/1,996.92 = 509.83/x
  3. Step 3: Cross multiply
    1,331.51x = 1,996.92 × 509.83
  4. Step 4: Simplify right side
    1,331.51x = 1,018,084.73
  5. Step 5: Solve for x
    x = 1,018,084.73/1,331.51
  6. Step 6: Final answer
    x = 764.61

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Double scale
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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.