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Finding the Fourth Proportional to 930.78, 1,396.12 and 518.65

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Solution

The fourth proportional to 930.78, 1,396.12 and 518.65 is: 777.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.78 : 1,396.12 = 518.65 : x
  2. Step 2: Convert to fraction form
    930.78/1,396.12 = 518.65/x
  3. Step 3: Cross multiply
    930.78x = 1,396.12 × 518.65
  4. Step 4: Simplify right side
    930.78x = 724,097.64
  5. Step 5: Solve for x
    x = 724,097.64/930.78
  6. Step 6: Final answer
    x = 777.95

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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.