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Finding the Fourth Proportional to 866.66, 1,296.79 and 520.20

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Solution

The fourth proportional to 866.66, 1,296.79 and 520.20 is: 778.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.66 : 1,296.79 = 520.20 : x
  2. Step 2: Convert to fraction form
    866.66/1,296.79 = 520.20/x
  3. Step 3: Cross multiply
    866.66x = 1,296.79 × 520.20
  4. Step 4: Simplify right side
    866.66x = 674,596.65
  5. Step 5: Solve for x
    x = 674,596.65/866.66
  6. Step 6: Final answer
    x = 778.39

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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.