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Finding the Fourth Proportional to 388.72, 536.52 and 231.40

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Solution

The fourth proportional to 388.72, 536.52 and 231.40 is: 319.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.72 : 536.52 = 231.40 : x
  2. Step 2: Convert to fraction form
    388.72/536.52 = 231.40/x
  3. Step 3: Cross multiply
    388.72x = 536.52 × 231.40
  4. Step 4: Simplify right side
    388.72x = 124,150.73
  5. Step 5: Solve for x
    x = 124,150.73/388.72
  6. Step 6: Final answer
    x = 319.38

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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.