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Finding the Fourth Proportional to 1,273.05, 1,909.22 and 493.20

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Solution

The fourth proportional to 1,273.05, 1,909.22 and 493.20 is: 739.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,273.05 : 1,909.22 = 493.20 : x
  2. Step 2: Convert to fraction form
    1,273.05/1,909.22 = 493.20/x
  3. Step 3: Cross multiply
    1,273.05x = 1,909.22 × 493.20
  4. Step 4: Simplify right side
    1,273.05x = 941,624.84
  5. Step 5: Solve for x
    x = 941,624.84/1,273.05
  6. Step 6: Final answer
    x = 739.66

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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.