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Finding the Fourth Proportional to 1,256.13, 1,884.21 and 682.65

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Solution

The fourth proportional to 1,256.13, 1,884.21 and 682.65 is: 1,023.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.13 : 1,884.21 = 682.65 : x
  2. Step 2: Convert to fraction form
    1,256.13/1,884.21 = 682.65/x
  3. Step 3: Cross multiply
    1,256.13x = 1,884.21 × 682.65
  4. Step 4: Simplify right side
    1,256.13x = 1,286,255.96
  5. Step 5: Solve for x
    x = 1,286,255.96/1,256.13
  6. Step 6: Final answer
    x = 1,023.98

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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.