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Finding the Fourth Proportional to 1,765.72, 2,647.14 and 739

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Solution

The fourth proportional to 1,765.72, 2,647.14 and 739 is: 1,107.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,765.72 : 2,647.14 = 739 : x
  2. Step 2: Convert to fraction form
    1,765.72/2,647.14 = 739/x
  3. Step 3: Cross multiply
    1,765.72x = 2,647.14 × 739
  4. Step 4: Simplify right side
    1,765.72x = 1,956,236.46
  5. Step 5: Solve for x
    x = 1,956,236.46/1,765.72
  6. Step 6: Final answer
    x = 1,107.90

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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.