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Finding the Fourth Proportional to 786.11, 1,178.82 and 663.39

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Solution

The fourth proportional to 786.11, 1,178.82 and 663.39 is: 994.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.11 : 1,178.82 = 663.39 : x
  2. Step 2: Convert to fraction form
    786.11/1,178.82 = 663.39/x
  3. Step 3: Cross multiply
    786.11x = 1,178.82 × 663.39
  4. Step 4: Simplify right side
    786.11x = 782,017.40
  5. Step 5: Solve for x
    x = 782,017.40/786.11
  6. Step 6: Final answer
    x = 994.80

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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.