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Finding the Fourth Proportional to 330.78, 456.03 and 281.55

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Solution

The fourth proportional to 330.78, 456.03 and 281.55 is: 388.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.78 : 456.03 = 281.55 : x
  2. Step 2: Convert to fraction form
    330.78/456.03 = 281.55/x
  3. Step 3: Cross multiply
    330.78x = 456.03 × 281.55
  4. Step 4: Simplify right side
    330.78x = 128,395.25
  5. Step 5: Solve for x
    x = 128,395.25/330.78
  6. Step 6: Final answer
    x = 388.16

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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.