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Finding the Fourth Proportional to 389.87, 538.10 and 224.20

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Solution

The fourth proportional to 389.87, 538.10 and 224.20 is: 309.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.87 : 538.10 = 224.20 : x
  2. Step 2: Convert to fraction form
    389.87/538.10 = 224.20/x
  3. Step 3: Cross multiply
    389.87x = 538.10 × 224.20
  4. Step 4: Simplify right side
    389.87x = 120,642.02
  5. Step 5: Solve for x
    x = 120,642.02/389.87
  6. Step 6: Final answer
    x = 309.44

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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.