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Finding the Fourth Proportional to 451.35, 675.72 and 399.90

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Solution

The fourth proportional to 451.35, 675.72 and 399.90 is: 598.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.35 : 675.72 = 399.90 : x
  2. Step 2: Convert to fraction form
    451.35/675.72 = 399.90/x
  3. Step 3: Cross multiply
    451.35x = 675.72 × 399.90
  4. Step 4: Simplify right side
    451.35x = 270,220.43
  5. Step 5: Solve for x
    x = 270,220.43/451.35
  6. Step 6: Final answer
    x = 598.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.