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Finding the Fourth Proportional to 1,213.52, 1,819.80 and 520.52

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Solution

The fourth proportional to 1,213.52, 1,819.80 and 520.52 is: 780.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.52 : 1,819.80 = 520.52 : x
  2. Step 2: Convert to fraction form
    1,213.52/1,819.80 = 520.52/x
  3. Step 3: Cross multiply
    1,213.52x = 1,819.80 × 520.52
  4. Step 4: Simplify right side
    1,213.52x = 947,233.20
  5. Step 5: Solve for x
    x = 947,233.20/1,213.52
  6. Step 6: Final answer
    x = 780.57

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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.