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Finding the Fourth Proportional to 1,212.05, 1,672.59 and 680.95

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Solution

The fourth proportional to 1,212.05, 1,672.59 and 680.95 is: 939.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.05 : 1,672.59 = 680.95 : x
  2. Step 2: Convert to fraction form
    1,212.05/1,672.59 = 680.95/x
  3. Step 3: Cross multiply
    1,212.05x = 1,672.59 × 680.95
  4. Step 4: Simplify right side
    1,212.05x = 1,138,950.16
  5. Step 5: Solve for x
    x = 1,138,950.16/1,212.05
  6. Step 6: Final answer
    x = 939.69

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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.