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Finding the Fourth Proportional to 520.98, 781.20 and 191.67

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Solution

The fourth proportional to 520.98, 781.20 and 191.67 is: 287.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.98 : 781.20 = 191.67 : x
  2. Step 2: Convert to fraction form
    520.98/781.20 = 191.67/x
  3. Step 3: Cross multiply
    520.98x = 781.20 × 191.67
  4. Step 4: Simplify right side
    520.98x = 149,732.60
  5. Step 5: Solve for x
    x = 149,732.60/520.98
  6. Step 6: Final answer
    x = 287.41

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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.