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Finding the Fourth Proportional to 388.23, 535.69 and 230.90

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Solution

The fourth proportional to 388.23, 535.69 and 230.90 is: 318.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.23 : 535.69 = 230.90 : x
  2. Step 2: Convert to fraction form
    388.23/535.69 = 230.90/x
  3. Step 3: Cross multiply
    388.23x = 535.69 × 230.90
  4. Step 4: Simplify right side
    388.23x = 123,692.85
  5. Step 5: Solve for x
    x = 123,692.85/388.23
  6. Step 6: Final answer
    x = 318.60

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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.