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Finding the Fourth Proportional to 2,143.78, 3,212.76 and 909.64

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Solution

The fourth proportional to 2,143.78, 3,212.76 and 909.64 is: 1,363.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,143.78 : 3,212.76 = 909.64 : x
  2. Step 2: Convert to fraction form
    2,143.78/3,212.76 = 909.64/x
  3. Step 3: Cross multiply
    2,143.78x = 3,212.76 × 909.64
  4. Step 4: Simplify right side
    2,143.78x = 2,922,463.04
  5. Step 5: Solve for x
    x = 2,922,463.04/2,143.78
  6. Step 6: Final answer
    x = 1,363.23

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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.