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Finding the Fourth Proportional to 1,212.80, 1,819.52 and 347.16

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Solution

The fourth proportional to 1,212.80, 1,819.52 and 347.16 is: 520.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.80 : 1,819.52 = 347.16 : x
  2. Step 2: Convert to fraction form
    1,212.80/1,819.52 = 347.16/x
  3. Step 3: Cross multiply
    1,212.80x = 1,819.52 × 347.16
  4. Step 4: Simplify right side
    1,212.80x = 631,664.56
  5. Step 5: Solve for x
    x = 631,664.56/1,212.80
  6. Step 6: Final answer
    x = 520.83

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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.