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Finding the Fourth Proportional to 439.36, 655.16 and 378.88

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Solution

The fourth proportional to 439.36, 655.16 and 378.88 is: 564.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.36 : 655.16 = 378.88 : x
  2. Step 2: Convert to fraction form
    439.36/655.16 = 378.88/x
  3. Step 3: Cross multiply
    439.36x = 655.16 × 378.88
  4. Step 4: Simplify right side
    439.36x = 248,227.02
  5. Step 5: Solve for x
    x = 248,227.02/439.36
  6. Step 6: Final answer
    x = 564.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.