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Finding the Fourth Proportional to 645.15, 890.32 and 350.43

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Solution

The fourth proportional to 645.15, 890.32 and 350.43 is: 483.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.15 : 890.32 = 350.43 : x
  2. Step 2: Convert to fraction form
    645.15/890.32 = 350.43/x
  3. Step 3: Cross multiply
    645.15x = 890.32 × 350.43
  4. Step 4: Simplify right side
    645.15x = 311,990.29
  5. Step 5: Solve for x
    x = 311,990.29/645.15
  6. Step 6: Final answer
    x = 483.59

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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.