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Finding the Fourth Proportional to 388.92, 536.82 and 223.22

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Solution

The fourth proportional to 388.92, 536.82 and 223.22 is: 308.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.92 : 536.82 = 223.22 : x
  2. Step 2: Convert to fraction form
    388.92/536.82 = 223.22/x
  3. Step 3: Cross multiply
    388.92x = 536.82 × 223.22
  4. Step 4: Simplify right side
    388.92x = 119,827.84
  5. Step 5: Solve for x
    x = 119,827.84/388.92
  6. Step 6: Final answer
    x = 308.10

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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.