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Finding the Fourth Proportional to 686.03, 1,027.08 and 425.25

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Solution

The fourth proportional to 686.03, 1,027.08 and 425.25 is: 636.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.03 : 1,027.08 = 425.25 : x
  2. Step 2: Convert to fraction form
    686.03/1,027.08 = 425.25/x
  3. Step 3: Cross multiply
    686.03x = 1,027.08 × 425.25
  4. Step 4: Simplify right side
    686.03x = 436,765.77
  5. Step 5: Solve for x
    x = 436,765.77/686.03
  6. Step 6: Final answer
    x = 636.66

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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.