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Finding the Fourth Proportional to 2,091.74, 3,134.87 and 857.70

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Solution

The fourth proportional to 2,091.74, 3,134.87 and 857.70 is: 1,285.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,091.74 : 3,134.87 = 857.70 : x
  2. Step 2: Convert to fraction form
    2,091.74/3,134.87 = 857.70/x
  3. Step 3: Cross multiply
    2,091.74x = 3,134.87 × 857.70
  4. Step 4: Simplify right side
    2,091.74x = 2,688,785.84
  5. Step 5: Solve for x
    x = 2,688,785.84/2,091.74
  6. Step 6: Final answer
    x = 1,285.43

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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.