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Finding the Fourth Proportional to 686.46, 1,027.44 and 622.50

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Solution

The fourth proportional to 686.46, 1,027.44 and 622.50 is: 931.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.46 : 1,027.44 = 622.50 : x
  2. Step 2: Convert to fraction form
    686.46/1,027.44 = 622.50/x
  3. Step 3: Cross multiply
    686.46x = 1,027.44 × 622.50
  4. Step 4: Simplify right side
    686.46x = 639,581.40
  5. Step 5: Solve for x
    x = 639,581.40/686.46
  6. Step 6: Final answer
    x = 931.71

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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.