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Finding the Fourth Proportional to 330.77, 455.81 and 256.96

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Solution

The fourth proportional to 330.77, 455.81 and 256.96 is: 354.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.77 : 455.81 = 256.96 : x
  2. Step 2: Convert to fraction form
    330.77/455.81 = 256.96/x
  3. Step 3: Cross multiply
    330.77x = 455.81 × 256.96
  4. Step 4: Simplify right side
    330.77x = 117,124.22
  5. Step 5: Solve for x
    x = 117,124.22/330.77
  6. Step 6: Final answer
    x = 354.09

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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.