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Finding the Fourth Proportional to 256.77, 356.18 and 247.05

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Solution

The fourth proportional to 256.77, 356.18 and 247.05 is: 342.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.77 : 356.18 = 247.05 : x
  2. Step 2: Convert to fraction form
    256.77/356.18 = 247.05/x
  3. Step 3: Cross multiply
    256.77x = 356.18 × 247.05
  4. Step 4: Simplify right side
    256.77x = 87,993.03
  5. Step 5: Solve for x
    x = 87,993.03/256.77
  6. Step 6: Final answer
    x = 342.69

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.