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Finding the Fourth Proportional to 521.41, 781.69 and 423.67

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Solution

The fourth proportional to 521.41, 781.69 and 423.67 is: 635.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.41 : 781.69 = 423.67 : x
  2. Step 2: Convert to fraction form
    521.41/781.69 = 423.67/x
  3. Step 3: Cross multiply
    521.41x = 781.69 × 423.67
  4. Step 4: Simplify right side
    521.41x = 331,176.15
  5. Step 5: Solve for x
    x = 331,176.15/521.41
  6. Step 6: Final answer
    x = 635.15

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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.