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Finding the Fourth Proportional to 2,143.22, 3,214.68 and 909.86

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Solution

The fourth proportional to 2,143.22, 3,214.68 and 909.86 is: 1,364.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,143.22 : 3,214.68 = 909.86 : x
  2. Step 2: Convert to fraction form
    2,143.22/3,214.68 = 909.86/x
  3. Step 3: Cross multiply
    2,143.22x = 3,214.68 × 909.86
  4. Step 4: Simplify right side
    2,143.22x = 2,924,908.74
  5. Step 5: Solve for x
    x = 2,924,908.74/2,143.22
  6. Step 6: Final answer
    x = 1,364.73

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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.