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Finding the Fourth Proportional to 3,886.68, 5,828.30 and 1,112.72

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Solution

The fourth proportional to 3,886.68, 5,828.30 and 1,112.72 is: 1,668.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,886.68 : 5,828.30 = 1,112.72 : x
  2. Step 2: Convert to fraction form
    3,886.68/5,828.30 = 1,112.72/x
  3. Step 3: Cross multiply
    3,886.68x = 5,828.30 × 1,112.72
  4. Step 4: Simplify right side
    3,886.68x = 6,485,285.41
  5. Step 5: Solve for x
    x = 6,485,285.41/3,886.68
  6. Step 6: Final answer
    x = 1,668.59

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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.