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Finding the Fourth Proportional to 1,212.52, 1,673.07 and 688.45

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Solution

The fourth proportional to 1,212.52, 1,673.07 and 688.45 is: 949.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.52 : 1,673.07 = 688.45 : x
  2. Step 2: Convert to fraction form
    1,212.52/1,673.07 = 688.45/x
  3. Step 3: Cross multiply
    1,212.52x = 1,673.07 × 688.45
  4. Step 4: Simplify right side
    1,212.52x = 1,151,816.68
  5. Step 5: Solve for x
    x = 1,151,816.68/1,212.52
  6. Step 6: Final answer
    x = 949.94

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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.