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Finding the Fourth Proportional to 418.90, 578.14 and 400.44

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Solution

The fourth proportional to 418.90, 578.14 and 400.44 is: 552.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.90 : 578.14 = 400.44 : x
  2. Step 2: Convert to fraction form
    418.90/578.14 = 400.44/x
  3. Step 3: Cross multiply
    418.90x = 578.14 × 400.44
  4. Step 4: Simplify right side
    418.90x = 231,511.38
  5. Step 5: Solve for x
    x = 231,511.38/418.90
  6. Step 6: Final answer
    x = 552.67

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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.