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Finding the Fourth Proportional to 645.28, 890.46 and 350.54

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Solution

The fourth proportional to 645.28, 890.46 and 350.54 is: 483.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.28 : 890.46 = 350.54 : x
  2. Step 2: Convert to fraction form
    645.28/890.46 = 350.54/x
  3. Step 3: Cross multiply
    645.28x = 890.46 × 350.54
  4. Step 4: Simplify right side
    645.28x = 312,145.39
  5. Step 5: Solve for x
    x = 312,145.39/645.28
  6. Step 6: Final answer
    x = 483.74

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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.