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Finding the Fourth Proportional to 2,809.42, 4,214.94 and 861.91

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Solution

The fourth proportional to 2,809.42, 4,214.94 and 861.91 is: 1,293.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,809.42 : 4,214.94 = 861.91 : x
  2. Step 2: Convert to fraction form
    2,809.42/4,214.94 = 861.91/x
  3. Step 3: Cross multiply
    2,809.42x = 4,214.94 × 861.91
  4. Step 4: Simplify right side
    2,809.42x = 3,632,885.17
  5. Step 5: Solve for x
    x = 3,632,885.17/2,809.42
  6. Step 6: Final answer
    x = 1,293.11

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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.