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Finding the Fourth Proportional to 645.52, 890.44 and 396.75

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Solution

The fourth proportional to 645.52, 890.44 and 396.75 is: 547.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.52 : 890.44 = 396.75 : x
  2. Step 2: Convert to fraction form
    645.52/890.44 = 396.75/x
  3. Step 3: Cross multiply
    645.52x = 890.44 × 396.75
  4. Step 4: Simplify right side
    645.52x = 353,281.64
  5. Step 5: Solve for x
    x = 353,281.64/645.52
  6. Step 6: Final answer
    x = 547.28

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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.