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Finding the Fourth Proportional to 961.03, 1,439.78 and 857.26

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Solution

The fourth proportional to 961.03, 1,439.78 and 857.26 is: 1,284.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.03 : 1,439.78 = 857.26 : x
  2. Step 2: Convert to fraction form
    961.03/1,439.78 = 857.26/x
  3. Step 3: Cross multiply
    961.03x = 1,439.78 × 857.26
  4. Step 4: Simplify right side
    961.03x = 1,234,259.27
  5. Step 5: Solve for x
    x = 1,234,259.27/961.03
  6. Step 6: Final answer
    x = 1,284.31

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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.