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Finding the Fourth Proportional to 1,212.68, 1,672.18 and 819.02

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Solution

The fourth proportional to 1,212.68, 1,672.18 and 819.02 is: 1,129.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.68 : 1,672.18 = 819.02 : x
  2. Step 2: Convert to fraction form
    1,212.68/1,672.18 = 819.02/x
  3. Step 3: Cross multiply
    1,212.68x = 1,672.18 × 819.02
  4. Step 4: Simplify right side
    1,212.68x = 1,369,551.00
  5. Step 5: Solve for x
    x = 1,369,551.00/1,212.68
  6. Step 6: Final answer
    x = 1,129.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.