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Finding the Fourth Proportional to 645.44, 890.72 and 350.72

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Solution

The fourth proportional to 645.44, 890.72 and 350.72 is: 483.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.44 : 890.72 = 350.72 : x
  2. Step 2: Convert to fraction form
    645.44/890.72 = 350.72/x
  3. Step 3: Cross multiply
    645.44x = 890.72 × 350.72
  4. Step 4: Simplify right side
    645.44x = 312,388.86
  5. Step 5: Solve for x
    x = 312,388.86/645.44
  6. Step 6: Final answer
    x = 483.99

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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.