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Finding the Fourth Proportional to 1,965.17, 2,947.80 and 869.33

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Solution

The fourth proportional to 1,965.17, 2,947.80 and 869.33 is: 1,304.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,965.17 : 2,947.80 = 869.33 : x
  2. Step 2: Convert to fraction form
    1,965.17/2,947.80 = 869.33/x
  3. Step 3: Cross multiply
    1,965.17x = 2,947.80 × 869.33
  4. Step 4: Simplify right side
    1,965.17x = 2,562,610.97
  5. Step 5: Solve for x
    x = 2,562,610.97/1,965.17
  6. Step 6: Final answer
    x = 1,304.01

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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.