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Finding the Fourth Proportional to 409.66, 615.31 and 255.68

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Solution

The fourth proportional to 409.66, 615.31 and 255.68 is: 384.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.66 : 615.31 = 255.68 : x
  2. Step 2: Convert to fraction form
    409.66/615.31 = 255.68/x
  3. Step 3: Cross multiply
    409.66x = 615.31 × 255.68
  4. Step 4: Simplify right side
    409.66x = 157,322.46
  5. Step 5: Solve for x
    x = 157,322.46/409.66
  6. Step 6: Final answer
    x = 384.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.