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Finding the Fourth Proportional to 849.89, 1,275.08 and 439.31

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Solution

The fourth proportional to 849.89, 1,275.08 and 439.31 is: 659.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.89 : 1,275.08 = 439.31 : x
  2. Step 2: Convert to fraction form
    849.89/1,275.08 = 439.31/x
  3. Step 3: Cross multiply
    849.89x = 1,275.08 × 439.31
  4. Step 4: Simplify right side
    849.89x = 560,156.39
  5. Step 5: Solve for x
    x = 560,156.39/849.89
  6. Step 6: Final answer
    x = 659.09

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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.