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Finding the Fourth Proportional to 721.14, 993.22 and 622.72

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Solution

The fourth proportional to 721.14, 993.22 and 622.72 is: 857.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.14 : 993.22 = 622.72 : x
  2. Step 2: Convert to fraction form
    721.14/993.22 = 622.72/x
  3. Step 3: Cross multiply
    721.14x = 993.22 × 622.72
  4. Step 4: Simplify right side
    721.14x = 618,497.96
  5. Step 5: Solve for x
    x = 618,497.96/721.14
  6. Step 6: Final answer
    x = 857.67

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Double scale
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1.5x scale

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.