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Finding the Fourth Proportional to 521.42, 781.94 and 228.90

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Solution

The fourth proportional to 521.42, 781.94 and 228.90 is: 343.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.42 : 781.94 = 228.90 : x
  2. Step 2: Convert to fraction form
    521.42/781.94 = 228.90/x
  3. Step 3: Cross multiply
    521.42x = 781.94 × 228.90
  4. Step 4: Simplify right side
    521.42x = 178,984.92
  5. Step 5: Solve for x
    x = 178,984.92/521.42
  6. Step 6: Final answer
    x = 343.27

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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.