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Finding the Fourth Proportional to 520.58, 781.02 and 212.60

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Solution

The fourth proportional to 520.58, 781.02 and 212.60 is: 318.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.58 : 781.02 = 212.60 : x
  2. Step 2: Convert to fraction form
    520.58/781.02 = 212.60/x
  3. Step 3: Cross multiply
    520.58x = 781.02 × 212.60
  4. Step 4: Simplify right side
    520.58x = 166,044.85
  5. Step 5: Solve for x
    x = 166,044.85/520.58
  6. Step 6: Final answer
    x = 318.96

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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.