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Finding the Fourth Proportional to 2,178.64, 3,266.65 and 878.59

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Solution

The fourth proportional to 2,178.64, 3,266.65 and 878.59 is: 1,317.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,178.64 : 3,266.65 = 878.59 : x
  2. Step 2: Convert to fraction form
    2,178.64/3,266.65 = 878.59/x
  3. Step 3: Cross multiply
    2,178.64x = 3,266.65 × 878.59
  4. Step 4: Simplify right side
    2,178.64x = 2,870,046.26
  5. Step 5: Solve for x
    x = 2,870,046.26/2,178.64
  6. Step 6: Final answer
    x = 1,317.36

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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.