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Finding the Fourth Proportional to 1,382.51, 2,073.90 and 516.89

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Solution

The fourth proportional to 1,382.51, 2,073.90 and 516.89 is: 775.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.51 : 2,073.90 = 516.89 : x
  2. Step 2: Convert to fraction form
    1,382.51/2,073.90 = 516.89/x
  3. Step 3: Cross multiply
    1,382.51x = 2,073.90 × 516.89
  4. Step 4: Simplify right side
    1,382.51x = 1,071,978.17
  5. Step 5: Solve for x
    x = 1,071,978.17/1,382.51
  6. Step 6: Final answer
    x = 775.39

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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.