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Finding the Fourth Proportional to 2,600.78, 3,900.33 and 869

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Solution

The fourth proportional to 2,600.78, 3,900.33 and 869 is: 1,303.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,600.78 : 3,900.33 = 869 : x
  2. Step 2: Convert to fraction form
    2,600.78/3,900.33 = 869/x
  3. Step 3: Cross multiply
    2,600.78x = 3,900.33 × 869
  4. Step 4: Simplify right side
    2,600.78x = 3,389,386.77
  5. Step 5: Solve for x
    x = 3,389,386.77/2,600.78
  6. Step 6: Final answer
    x = 1,303.22

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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.