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Finding the Fourth Proportional to 1,765.62, 2,647.64 and 724.77

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Solution

The fourth proportional to 1,765.62, 2,647.64 and 724.77 is: 1,086.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,765.62 : 2,647.64 = 724.77 : x
  2. Step 2: Convert to fraction form
    1,765.62/2,647.64 = 724.77/x
  3. Step 3: Cross multiply
    1,765.62x = 2,647.64 × 724.77
  4. Step 4: Simplify right side
    1,765.62x = 1,918,931.85
  5. Step 5: Solve for x
    x = 1,918,931.85/1,765.62
  6. Step 6: Final answer
    x = 1,086.83

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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.