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Finding the Fourth Proportional to 330.55, 455.78 and 268.19

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Solution

The fourth proportional to 330.55, 455.78 and 268.19 is: 369.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.55 : 455.78 = 268.19 : x
  2. Step 2: Convert to fraction form
    330.55/455.78 = 268.19/x
  3. Step 3: Cross multiply
    330.55x = 455.78 × 268.19
  4. Step 4: Simplify right side
    330.55x = 122,232.02
  5. Step 5: Solve for x
    x = 122,232.02/330.55
  6. Step 6: Final answer
    x = 369.78

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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.