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Finding the Fourth Proportional to 686.23, 1,030.07 and 321.37

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Solution

The fourth proportional to 686.23, 1,030.07 and 321.37 is: 482.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.23 : 1,030.07 = 321.37 : x
  2. Step 2: Convert to fraction form
    686.23/1,030.07 = 321.37/x
  3. Step 3: Cross multiply
    686.23x = 1,030.07 × 321.37
  4. Step 4: Simplify right side
    686.23x = 331,031.82
  5. Step 5: Solve for x
    x = 331,031.82/686.23
  6. Step 6: Final answer
    x = 482.39

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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.