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Finding the Fourth Proportional to 1,296.35, 1,789.61 and 878.90

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Solution

The fourth proportional to 1,296.35, 1,789.61 and 878.90 is: 1,213.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.35 : 1,789.61 = 878.90 : x
  2. Step 2: Convert to fraction form
    1,296.35/1,789.61 = 878.90/x
  3. Step 3: Cross multiply
    1,296.35x = 1,789.61 × 878.90
  4. Step 4: Simplify right side
    1,296.35x = 1,572,888.23
  5. Step 5: Solve for x
    x = 1,572,888.23/1,296.35
  6. Step 6: Final answer
    x = 1,213.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.