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Finding the Fourth Proportional to 686.40, 1,031.88 and 635.67

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Solution

The fourth proportional to 686.40, 1,031.88 and 635.67 is: 955.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.40 : 1,031.88 = 635.67 : x
  2. Step 2: Convert to fraction form
    686.40/1,031.88 = 635.67/x
  3. Step 3: Cross multiply
    686.40x = 1,031.88 × 635.67
  4. Step 4: Simplify right side
    686.40x = 655,935.16
  5. Step 5: Solve for x
    x = 655,935.16/686.40
  6. Step 6: Final answer
    x = 955.62

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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.