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Finding the Fourth Proportional to 1,780.72, 2,672.50 and 806.90

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Solution

The fourth proportional to 1,780.72, 2,672.50 and 806.90 is: 1,210.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.72 : 2,672.50 = 806.90 : x
  2. Step 2: Convert to fraction form
    1,780.72/2,672.50 = 806.90/x
  3. Step 3: Cross multiply
    1,780.72x = 2,672.50 × 806.90
  4. Step 4: Simplify right side
    1,780.72x = 2,156,440.25
  5. Step 5: Solve for x
    x = 2,156,440.25/1,780.72
  6. Step 6: Final answer
    x = 1,210.99

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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.