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Finding the Fourth Proportional to 388.99, 536.82 and 223.21

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Solution

The fourth proportional to 388.99, 536.82 and 223.21 is: 308.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.99 : 536.82 = 223.21 : x
  2. Step 2: Convert to fraction form
    388.99/536.82 = 223.21/x
  3. Step 3: Cross multiply
    388.99x = 536.82 × 223.21
  4. Step 4: Simplify right side
    388.99x = 119,823.59
  5. Step 5: Solve for x
    x = 119,823.59/388.99
  6. Step 6: Final answer
    x = 308.04

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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.