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Finding the Fourth Proportional to 1,212.29, 1,672.98 and 688.35

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Solution

The fourth proportional to 1,212.29, 1,672.98 and 688.35 is: 949.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.29 : 1,672.98 = 688.35 : x
  2. Step 2: Convert to fraction form
    1,212.29/1,672.98 = 688.35/x
  3. Step 3: Cross multiply
    1,212.29x = 1,672.98 × 688.35
  4. Step 4: Simplify right side
    1,212.29x = 1,151,595.78
  5. Step 5: Solve for x
    x = 1,151,595.78/1,212.29
  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.