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Finding the Fourth Proportional to 2,809.70, 4,214.40 and 861.75

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Solution

The fourth proportional to 2,809.70, 4,214.40 and 861.75 is: 1,292.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,809.70 : 4,214.40 = 861.75 : x
  2. Step 2: Convert to fraction form
    2,809.70/4,214.40 = 861.75/x
  3. Step 3: Cross multiply
    2,809.70x = 4,214.40 × 861.75
  4. Step 4: Simplify right side
    2,809.70x = 3,631,759.20
  5. Step 5: Solve for x
    x = 3,631,759.20/2,809.70
  6. Step 6: Final answer
    x = 1,292.58

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1.5x scale

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.