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Finding the Fourth Proportional to 1,259.82, 1,889.60 and 851.58

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Solution

The fourth proportional to 1,259.82, 1,889.60 and 851.58 is: 1,277.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.82 : 1,889.60 = 851.58 : x
  2. Step 2: Convert to fraction form
    1,259.82/1,889.60 = 851.58/x
  3. Step 3: Cross multiply
    1,259.82x = 1,889.60 × 851.58
  4. Step 4: Simplify right side
    1,259.82x = 1,609,145.57
  5. Step 5: Solve for x
    x = 1,609,145.57/1,259.82
  6. Step 6: Final answer
    x = 1,277.28

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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.