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Finding the Fourth Proportional to 256.86, 354.48 and 143.31

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Solution

The fourth proportional to 256.86, 354.48 and 143.31 is: 197.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.86 : 354.48 = 143.31 : x
  2. Step 2: Convert to fraction form
    256.86/354.48 = 143.31/x
  3. Step 3: Cross multiply
    256.86x = 354.48 × 143.31
  4. Step 4: Simplify right side
    256.86x = 50,798.66
  5. Step 5: Solve for x
    x = 50,798.66/256.86
  6. Step 6: Final answer
    x = 197.77

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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.