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Finding the Fourth Proportional to 1,421.60, 2,131.83 and 681

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Solution

The fourth proportional to 1,421.60, 2,131.83 and 681 is: 1,021.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.60 : 2,131.83 = 681 : x
  2. Step 2: Convert to fraction form
    1,421.60/2,131.83 = 681/x
  3. Step 3: Cross multiply
    1,421.60x = 2,131.83 × 681
  4. Step 4: Simplify right side
    1,421.60x = 1,451,776.23
  5. Step 5: Solve for x
    x = 1,451,776.23/1,421.60
  6. Step 6: Final answer
    x = 1,021.23

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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.