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Finding the Fourth Proportional to 686.66, 947.91 and 450.95

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Solution

The fourth proportional to 686.66, 947.91 and 450.95 is: 622.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.66 : 947.91 = 450.95 : x
  2. Step 2: Convert to fraction form
    686.66/947.91 = 450.95/x
  3. Step 3: Cross multiply
    686.66x = 947.91 × 450.95
  4. Step 4: Simplify right side
    686.66x = 427,460.01
  5. Step 5: Solve for x
    x = 427,460.01/686.66
  6. Step 6: Final answer
    x = 622.52

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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.