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Finding the Fourth Proportional to 2,600.96, 3,900.18 and 869

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Solution

The fourth proportional to 2,600.96, 3,900.18 and 869 is: 1,303.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,600.96 : 3,900.18 = 869 : x
  2. Step 2: Convert to fraction form
    2,600.96/3,900.18 = 869/x
  3. Step 3: Cross multiply
    2,600.96x = 3,900.18 × 869
  4. Step 4: Simplify right side
    2,600.96x = 3,389,256.42
  5. Step 5: Solve for x
    x = 3,389,256.42/2,600.96
  6. Step 6: Final answer
    x = 1,303.08

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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.