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Finding the Fourth Proportional to 1,381.86, 2,073.60 and 516.78

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Solution

The fourth proportional to 1,381.86, 2,073.60 and 516.78 is: 775.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.86 : 2,073.60 = 516.78 : x
  2. Step 2: Convert to fraction form
    1,381.86/2,073.60 = 516.78/x
  3. Step 3: Cross multiply
    1,381.86x = 2,073.60 × 516.78
  4. Step 4: Simplify right side
    1,381.86x = 1,071,595.01
  5. Step 5: Solve for x
    x = 1,071,595.01/1,381.86
  6. Step 6: Final answer
    x = 775.47

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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.