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Finding the Fourth Proportional to 2,142.39, 3,213.68 and 681.65

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Solution

The fourth proportional to 2,142.39, 3,213.68 and 681.65 is: 1,022.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,142.39 : 3,213.68 = 681.65 : x
  2. Step 2: Convert to fraction form
    2,142.39/3,213.68 = 681.65/x
  3. Step 3: Cross multiply
    2,142.39x = 3,213.68 × 681.65
  4. Step 4: Simplify right side
    2,142.39x = 2,190,585.50
  5. Step 5: Solve for x
    x = 2,190,585.50/2,142.39
  6. Step 6: Final answer
    x = 1,022.50

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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.