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Finding the Fourth Proportional to 688.56, 949.23 and 511.26

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Solution

The fourth proportional to 688.56, 949.23 and 511.26 is: 704.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.56 : 949.23 = 511.26 : x
  2. Step 2: Convert to fraction form
    688.56/949.23 = 511.26/x
  3. Step 3: Cross multiply
    688.56x = 949.23 × 511.26
  4. Step 4: Simplify right side
    688.56x = 485,303.33
  5. Step 5: Solve for x
    x = 485,303.33/688.56
  6. Step 6: Final answer
    x = 704.81

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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.