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Finding the Fourth Proportional to 687.68, 1,031.51 and 201.06

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Solution

The fourth proportional to 687.68, 1,031.51 and 201.06 is: 301.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.68 : 1,031.51 = 201.06 : x
  2. Step 2: Convert to fraction form
    687.68/1,031.51 = 201.06/x
  3. Step 3: Cross multiply
    687.68x = 1,031.51 × 201.06
  4. Step 4: Simplify right side
    687.68x = 207,394.40
  5. Step 5: Solve for x
    x = 207,394.40/687.68
  6. Step 6: Final answer
    x = 301.59

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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.