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Finding the Fourth Proportional to 388.69, 536.42 and 222.91

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Solution

The fourth proportional to 388.69, 536.42 and 222.91 is: 307.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.69 : 536.42 = 222.91 : x
  2. Step 2: Convert to fraction form
    388.69/536.42 = 222.91/x
  3. Step 3: Cross multiply
    388.69x = 536.42 × 222.91
  4. Step 4: Simplify right side
    388.69x = 119,570.93
  5. Step 5: Solve for x
    x = 119,570.93/388.69
  6. Step 6: Final answer
    x = 307.63

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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.