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Finding the Fourth Proportional to 2,166.72, 3,251.70 and 780.08

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Solution

The fourth proportional to 2,166.72, 3,251.70 and 780.08 is: 1,170.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,166.72 : 3,251.70 = 780.08 : x
  2. Step 2: Convert to fraction form
    2,166.72/3,251.70 = 780.08/x
  3. Step 3: Cross multiply
    2,166.72x = 3,251.70 × 780.08
  4. Step 4: Simplify right side
    2,166.72x = 2,536,569.88
  5. Step 5: Solve for x
    x = 2,536,569.88/2,166.72
  6. Step 6: Final answer
    x = 1,170.70

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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.