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Finding the Fourth Proportional to 687.84, 1,031.66 and 200.79

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Solution

The fourth proportional to 687.84, 1,031.66 and 200.79 is: 301.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.84 : 1,031.66 = 200.79 : x
  2. Step 2: Convert to fraction form
    687.84/1,031.66 = 200.79/x
  3. Step 3: Cross multiply
    687.84x = 1,031.66 × 200.79
  4. Step 4: Simplify right side
    687.84x = 207,146.01
  5. Step 5: Solve for x
    x = 207,146.01/687.84
  6. Step 6: Final answer
    x = 301.15

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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.