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Finding the Fourth Proportional to 849.22, 1,274.10 and 387.19

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Solution

The fourth proportional to 849.22, 1,274.10 and 387.19 is: 580.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.22 : 1,274.10 = 387.19 : x
  2. Step 2: Convert to fraction form
    849.22/1,274.10 = 387.19/x
  3. Step 3: Cross multiply
    849.22x = 1,274.10 × 387.19
  4. Step 4: Simplify right side
    849.22x = 493,318.78
  5. Step 5: Solve for x
    x = 493,318.78/849.22
  6. Step 6: Final answer
    x = 580.91

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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.