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Finding the Fourth Proportional to 1,965.20, 2,947.16 and 869.54

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Solution

The fourth proportional to 1,965.20, 2,947.16 and 869.54 is: 1,304.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,965.20 : 2,947.16 = 869.54 : x
  2. Step 2: Convert to fraction form
    1,965.20/2,947.16 = 869.54/x
  3. Step 3: Cross multiply
    1,965.20x = 2,947.16 × 869.54
  4. Step 4: Simplify right side
    1,965.20x = 2,562,673.51
  5. Step 5: Solve for x
    x = 2,562,673.51/1,965.20
  6. Step 6: Final answer
    x = 1,304.03

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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.