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Finding the Fourth Proportional to 687.50, 1,031.28 and 200.59

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Solution

The fourth proportional to 687.50, 1,031.28 and 200.59 is: 300.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.50 : 1,031.28 = 200.59 : x
  2. Step 2: Convert to fraction form
    687.50/1,031.28 = 200.59/x
  3. Step 3: Cross multiply
    687.50x = 1,031.28 × 200.59
  4. Step 4: Simplify right side
    687.50x = 206,864.46
  5. Step 5: Solve for x
    x = 206,864.46/687.50
  6. Step 6: Final answer
    x = 300.89

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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.