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Finding the Fourth Proportional to 786.34, 1,178.39 and 579.28

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Solution

The fourth proportional to 786.34, 1,178.39 and 579.28 is: 868.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.34 : 1,178.39 = 579.28 : x
  2. Step 2: Convert to fraction form
    786.34/1,178.39 = 579.28/x
  3. Step 3: Cross multiply
    786.34x = 1,178.39 × 579.28
  4. Step 4: Simplify right side
    786.34x = 682,616.29
  5. Step 5: Solve for x
    x = 682,616.29/786.34
  6. Step 6: Final answer
    x = 868.09

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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.