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Finding the Fourth Proportional to 389.16, 536.94 and 223.43

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Solution

The fourth proportional to 389.16, 536.94 and 223.43 is: 308.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.16 : 536.94 = 223.43 : x
  2. Step 2: Convert to fraction form
    389.16/536.94 = 223.43/x
  3. Step 3: Cross multiply
    389.16x = 536.94 × 223.43
  4. Step 4: Simplify right side
    389.16x = 119,965.82
  5. Step 5: Solve for x
    x = 119,965.82/389.16
  6. Step 6: Final answer
    x = 308.27

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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.