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Finding the Fourth Proportional to 688.33, 949.84 and 389.56

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Solution

The fourth proportional to 688.33, 949.84 and 389.56 is: 537.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.33 : 949.84 = 389.56 : x
  2. Step 2: Convert to fraction form
    688.33/949.84 = 389.56/x
  3. Step 3: Cross multiply
    688.33x = 949.84 × 389.56
  4. Step 4: Simplify right side
    688.33x = 370,012.97
  5. Step 5: Solve for x
    x = 370,012.97/688.33
  6. Step 6: Final answer
    x = 537.56

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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.