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Finding the Fourth Proportional to 439.44, 655.82 and 390.84

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Solution

The fourth proportional to 439.44, 655.82 and 390.84 is: 583.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.44 : 655.82 = 390.84 : x
  2. Step 2: Convert to fraction form
    439.44/655.82 = 390.84/x
  3. Step 3: Cross multiply
    439.44x = 655.82 × 390.84
  4. Step 4: Simplify right side
    439.44x = 256,320.69
  5. Step 5: Solve for x
    x = 256,320.69/439.44
  6. Step 6: Final answer
    x = 583.29

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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.