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Finding the Fourth Proportional to 387, 534.13 and 231.75

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Solution

The fourth proportional to 387, 534.13 and 231.75 is: 319.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    387 : 534.13 = 231.75 : x
  2. Step 2: Convert to fraction form
    387/534.13 = 231.75/x
  3. Step 3: Cross multiply
    387x = 534.13 × 231.75
  4. Step 4: Simplify right side
    387x = 123,784.05
  5. Step 5: Solve for x
    x = 123,784.05/387
  6. Step 6: Final answer
    x = 319.86

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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.