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Finding the Fourth Proportional to 688.38, 1,032.36 and 201.31

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Solution

The fourth proportional to 688.38, 1,032.36 and 201.31 is: 301.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.38 : 1,032.36 = 201.31 : x
  2. Step 2: Convert to fraction form
    688.38/1,032.36 = 201.31/x
  3. Step 3: Cross multiply
    688.38x = 1,032.36 × 201.31
  4. Step 4: Simplify right side
    688.38x = 207,824.39
  5. Step 5: Solve for x
    x = 207,824.39/688.38
  6. Step 6: Final answer
    x = 301.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.