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Finding the Fourth Proportional to 643.22, 964.83 and 451.70

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Solution

The fourth proportional to 643.22, 964.83 and 451.70 is: 677.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.22 : 964.83 = 451.70 : x
  2. Step 2: Convert to fraction form
    643.22/964.83 = 451.70/x
  3. Step 3: Cross multiply
    643.22x = 964.83 × 451.70
  4. Step 4: Simplify right side
    643.22x = 435,813.71
  5. Step 5: Solve for x
    x = 435,813.71/643.22
  6. Step 6: Final answer
    x = 677.55

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Double scale
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Similar ratio
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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.