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Finding the Fourth Proportional to 1,295.30, 1,939.14 and 855.74

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Solution

The fourth proportional to 1,295.30, 1,939.14 and 855.74 is: 1,281.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,295.30 : 1,939.14 = 855.74 : x
  2. Step 2: Convert to fraction form
    1,295.30/1,939.14 = 855.74/x
  3. Step 3: Cross multiply
    1,295.30x = 1,939.14 × 855.74
  4. Step 4: Simplify right side
    1,295.30x = 1,659,399.66
  5. Step 5: Solve for x
    x = 1,659,399.66/1,295.30
  6. Step 6: Final answer
    x = 1,281.09

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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.