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Finding the Fourth Proportional to 1,273.09, 1,909.67 and 656.41

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Solution

The fourth proportional to 1,273.09, 1,909.67 and 656.41 is: 984.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,273.09 : 1,909.67 = 656.41 : x
  2. Step 2: Convert to fraction form
    1,273.09/1,909.67 = 656.41/x
  3. Step 3: Cross multiply
    1,273.09x = 1,909.67 × 656.41
  4. Step 4: Simplify right side
    1,273.09x = 1,253,526.48
  5. Step 5: Solve for x
    x = 1,253,526.48/1,273.09
  6. Step 6: Final answer
    x = 984.63

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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.