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Finding the Fourth Proportional to 401.43, 554.16 and 303.21

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Solution

The fourth proportional to 401.43, 554.16 and 303.21 is: 418.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.43 : 554.16 = 303.21 : x
  2. Step 2: Convert to fraction form
    401.43/554.16 = 303.21/x
  3. Step 3: Cross multiply
    401.43x = 554.16 × 303.21
  4. Step 4: Simplify right side
    401.43x = 168,026.85
  5. Step 5: Solve for x
    x = 168,026.85/401.43
  6. Step 6: Final answer
    x = 418.57

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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.