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Finding the Fourth Proportional to 388.39, 535.95 and 220.31

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Solution

The fourth proportional to 388.39, 535.95 and 220.31 is: 304.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.39 : 535.95 = 220.31 : x
  2. Step 2: Convert to fraction form
    388.39/535.95 = 220.31/x
  3. Step 3: Cross multiply
    388.39x = 535.95 × 220.31
  4. Step 4: Simplify right side
    388.39x = 118,072.46
  5. Step 5: Solve for x
    x = 118,072.46/388.39
  6. Step 6: Final answer
    x = 304.01

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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.