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Finding the Fourth Proportional to 645.70, 891.06 and 350.96

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Solution

The fourth proportional to 645.70, 891.06 and 350.96 is: 484.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.70 : 891.06 = 350.96 : x
  2. Step 2: Convert to fraction form
    645.70/891.06 = 350.96/x
  3. Step 3: Cross multiply
    645.70x = 891.06 × 350.96
  4. Step 4: Simplify right side
    645.70x = 312,729.52
  5. Step 5: Solve for x
    x = 312,729.52/645.70
  6. Step 6: Final answer
    x = 484.33

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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.