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Finding the Fourth Proportional to 686.68, 948.06 and 451.05

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Solution

The fourth proportional to 686.68, 948.06 and 451.05 is: 622.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.68 : 948.06 = 451.05 : x
  2. Step 2: Convert to fraction form
    686.68/948.06 = 451.05/x
  3. Step 3: Cross multiply
    686.68x = 948.06 × 451.05
  4. Step 4: Simplify right side
    686.68x = 427,621.15
  5. Step 5: Solve for x
    x = 427,621.15/686.68
  6. Step 6: Final answer
    x = 622.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.