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Finding the Fourth Proportional to 758.82, 1,139.34 and 663.78

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Solution

The fourth proportional to 758.82, 1,139.34 and 663.78 is: 996.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.82 : 1,139.34 = 663.78 : x
  2. Step 2: Convert to fraction form
    758.82/1,139.34 = 663.78/x
  3. Step 3: Cross multiply
    758.82x = 1,139.34 × 663.78
  4. Step 4: Simplify right side
    758.82x = 756,271.11
  5. Step 5: Solve for x
    x = 756,271.11/758.82
  6. Step 6: Final answer
    x = 996.64

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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.