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Finding the Fourth Proportional to 318.03, 439.22 and 256.06

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Solution

The fourth proportional to 318.03, 439.22 and 256.06 is: 353.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.03 : 439.22 = 256.06 : x
  2. Step 2: Convert to fraction form
    318.03/439.22 = 256.06/x
  3. Step 3: Cross multiply
    318.03x = 439.22 × 256.06
  4. Step 4: Simplify right side
    318.03x = 112,467.86
  5. Step 5: Solve for x
    x = 112,467.86/318.03
  6. Step 6: Final answer
    x = 353.64

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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.