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Finding the Fourth Proportional to 256.06, 353.37 and 139.63

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Solution

The fourth proportional to 256.06, 353.37 and 139.63 is: 192.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.06 : 353.37 = 139.63 : x
  2. Step 2: Convert to fraction form
    256.06/353.37 = 139.63/x
  3. Step 3: Cross multiply
    256.06x = 353.37 × 139.63
  4. Step 4: Simplify right side
    256.06x = 49,341.05
  5. Step 5: Solve for x
    x = 49,341.05/256.06
  6. Step 6: Final answer
    x = 192.69

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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.