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Finding the Fourth Proportional to 521.49, 781.09 and 338.33

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Solution

The fourth proportional to 521.49, 781.09 and 338.33 is: 506.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.49 : 781.09 = 338.33 : x
  2. Step 2: Convert to fraction form
    521.49/781.09 = 338.33/x
  3. Step 3: Cross multiply
    521.49x = 781.09 × 338.33
  4. Step 4: Simplify right side
    521.49x = 264,266.18
  5. Step 5: Solve for x
    x = 264,266.18/521.49
  6. Step 6: Final answer
    x = 506.75

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1.5x scale

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.