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Finding the Fourth Proportional to 388.99, 536.81 and 223.16

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Solution

The fourth proportional to 388.99, 536.81 and 223.16 is: 307.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.99 : 536.81 = 223.16 : x
  2. Step 2: Convert to fraction form
    388.99/536.81 = 223.16/x
  3. Step 3: Cross multiply
    388.99x = 536.81 × 223.16
  4. Step 4: Simplify right side
    388.99x = 119,791.98
  5. Step 5: Solve for x
    x = 119,791.98/388.99
  6. Step 6: Final answer
    x = 307.96

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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.