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Finding the Fourth Proportional to 1,781.45, 2,672.76 and 856.89

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Solution

The fourth proportional to 1,781.45, 2,672.76 and 856.89 is: 1,285.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.45 : 2,672.76 = 856.89 : x
  2. Step 2: Convert to fraction form
    1,781.45/2,672.76 = 856.89/x
  3. Step 3: Cross multiply
    1,781.45x = 2,672.76 × 856.89
  4. Step 4: Simplify right side
    1,781.45x = 2,290,259.21
  5. Step 5: Solve for x
    x = 2,290,259.21/1,781.45
  6. Step 6: Final answer
    x = 1,285.61

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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.