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Finding the Fourth Proportional to 849.72, 1,273.88 and 387.39

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Solution

The fourth proportional to 849.72, 1,273.88 and 387.39 is: 580.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.72 : 1,273.88 = 387.39 : x
  2. Step 2: Convert to fraction form
    849.72/1,273.88 = 387.39/x
  3. Step 3: Cross multiply
    849.72x = 1,273.88 × 387.39
  4. Step 4: Simplify right side
    849.72x = 493,486.44
  5. Step 5: Solve for x
    x = 493,486.44/849.72
  6. Step 6: Final answer
    x = 580.76

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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.