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Finding the Fourth Proportional to 2,600.76, 3,898.10 and 1,285.11

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Solution

The fourth proportional to 2,600.76, 3,898.10 and 1,285.11 is: 1,926.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,600.76 : 3,898.10 = 1,285.11 : x
  2. Step 2: Convert to fraction form
    2,600.76/3,898.10 = 1,285.11/x
  3. Step 3: Cross multiply
    2,600.76x = 3,898.10 × 1,285.11
  4. Step 4: Simplify right side
    2,600.76x = 5,009,480.87
  5. Step 5: Solve for x
    x = 5,009,480.87/2,600.76
  6. Step 6: Final answer
    x = 1,926.16

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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.