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Finding the Fourth Proportional to 418.32, 628.19 and 400.90

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Solution

The fourth proportional to 418.32, 628.19 and 400.90 is: 602.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.32 : 628.19 = 400.90 : x
  2. Step 2: Convert to fraction form
    418.32/628.19 = 400.90/x
  3. Step 3: Cross multiply
    418.32x = 628.19 × 400.90
  4. Step 4: Simplify right side
    418.32x = 251,841.37
  5. Step 5: Solve for x
    x = 251,841.37/418.32
  6. Step 6: Final answer
    x = 602.03

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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.