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Finding the Fourth Proportional to 521.28, 781.54 and 247.05

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Solution

The fourth proportional to 521.28, 781.54 and 247.05 is: 370.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.28 : 781.54 = 247.05 : x
  2. Step 2: Convert to fraction form
    521.28/781.54 = 247.05/x
  3. Step 3: Cross multiply
    521.28x = 781.54 × 247.05
  4. Step 4: Simplify right side
    521.28x = 193,078.84
  5. Step 5: Solve for x
    x = 193,078.84/521.28
  6. Step 6: Final answer
    x = 370.39

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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.