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Finding the Fourth Proportional to 687.22, 1,031.16 and 679.66

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Solution

The fourth proportional to 687.22, 1,031.16 and 679.66 is: 1,019.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.22 : 1,031.16 = 679.66 : x
  2. Step 2: Convert to fraction form
    687.22/1,031.16 = 679.66/x
  3. Step 3: Cross multiply
    687.22x = 1,031.16 × 679.66
  4. Step 4: Simplify right side
    687.22x = 700,838.21
  5. Step 5: Solve for x
    x = 700,838.21/687.22
  6. Step 6: Final answer
    x = 1,019.82

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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.