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Finding the Fourth Proportional to 661.70, 991.36 and 622.66

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Solution

The fourth proportional to 661.70, 991.36 and 622.66 is: 932.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.70 : 991.36 = 622.66 : x
  2. Step 2: Convert to fraction form
    661.70/991.36 = 622.66/x
  3. Step 3: Cross multiply
    661.70x = 991.36 × 622.66
  4. Step 4: Simplify right side
    661.70x = 617,280.22
  5. Step 5: Solve for x
    x = 617,280.22/661.70
  6. Step 6: Final answer
    x = 932.87

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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.