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Finding the Fourth Proportional to 807.68, 1,212.78 and 516.08

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Solution

The fourth proportional to 807.68, 1,212.78 and 516.08 is: 774.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.68 : 1,212.78 = 516.08 : x
  2. Step 2: Convert to fraction form
    807.68/1,212.78 = 516.08/x
  3. Step 3: Cross multiply
    807.68x = 1,212.78 × 516.08
  4. Step 4: Simplify right side
    807.68x = 625,891.50
  5. Step 5: Solve for x
    x = 625,891.50/807.68
  6. Step 6: Final answer
    x = 774.93

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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.