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Finding the Fourth Proportional to 285.86, 393.86 and 238.98

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Solution

The fourth proportional to 285.86, 393.86 and 238.98 is: 329.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.86 : 393.86 = 238.98 : x
  2. Step 2: Convert to fraction form
    285.86/393.86 = 238.98/x
  3. Step 3: Cross multiply
    285.86x = 393.86 × 238.98
  4. Step 4: Simplify right side
    285.86x = 94,124.66
  5. Step 5: Solve for x
    x = 94,124.66/285.86
  6. Step 6: Final answer
    x = 329.27

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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.