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Finding the Fourth Proportional to 2,142.93, 3,214.62 and 681.74

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Solution

The fourth proportional to 2,142.93, 3,214.62 and 681.74 is: 1,022.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,142.93 : 3,214.62 = 681.74 : x
  2. Step 2: Convert to fraction form
    2,142.93/3,214.62 = 681.74/x
  3. Step 3: Cross multiply
    2,142.93x = 3,214.62 × 681.74
  4. Step 4: Simplify right side
    2,142.93x = 2,191,525.54
  5. Step 5: Solve for x
    x = 2,191,525.54/2,142.93
  6. Step 6: Final answer
    x = 1,022.68

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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.