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Finding the Fourth Proportional to 257.96, 387.12 and 235.28

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Solution

The fourth proportional to 257.96, 387.12 and 235.28 is: 353.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.96 : 387.12 = 235.28 : x
  2. Step 2: Convert to fraction form
    257.96/387.12 = 235.28/x
  3. Step 3: Cross multiply
    257.96x = 387.12 × 235.28
  4. Step 4: Simplify right side
    257.96x = 91,081.59
  5. Step 5: Solve for x
    x = 91,081.59/257.96
  6. Step 6: Final answer
    x = 353.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.