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Finding the Fourth Proportional to 330.24, 455.76 and 281.28

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Solution

The fourth proportional to 330.24, 455.76 and 281.28 is: 388.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.24 : 455.76 = 281.28 : x
  2. Step 2: Convert to fraction form
    330.24/455.76 = 281.28/x
  3. Step 3: Cross multiply
    330.24x = 455.76 × 281.28
  4. Step 4: Simplify right side
    330.24x = 128,196.17
  5. Step 5: Solve for x
    x = 128,196.17/330.24
  6. Step 6: Final answer
    x = 388.19

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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.