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Finding the Fourth Proportional to 790.86, 1,186.89 and 516.87

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Solution

The fourth proportional to 790.86, 1,186.89 and 516.87 is: 775.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.86 : 1,186.89 = 516.87 : x
  2. Step 2: Convert to fraction form
    790.86/1,186.89 = 516.87/x
  3. Step 3: Cross multiply
    790.86x = 1,186.89 × 516.87
  4. Step 4: Simplify right side
    790.86x = 613,467.83
  5. Step 5: Solve for x
    x = 613,467.83/790.86
  6. Step 6: Final answer
    x = 775.70

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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.