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Finding the Fourth Proportional to 390.11, 538.38 and 224.30

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Solution

The fourth proportional to 390.11, 538.38 and 224.30 is: 309.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.11 : 538.38 = 224.30 : x
  2. Step 2: Convert to fraction form
    390.11/538.38 = 224.30/x
  3. Step 3: Cross multiply
    390.11x = 538.38 × 224.30
  4. Step 4: Simplify right side
    390.11x = 120,759.98
  5. Step 5: Solve for x
    x = 120,759.98/390.11
  6. Step 6: Final answer
    x = 309.56

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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.