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Finding the Fourth Proportional to 521.44, 718.72 and 439.36

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Solution

The fourth proportional to 521.44, 718.72 and 439.36 is: 605.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.44 : 718.72 = 439.36 : x
  2. Step 2: Convert to fraction form
    521.44/718.72 = 439.36/x
  3. Step 3: Cross multiply
    521.44x = 718.72 × 439.36
  4. Step 4: Simplify right side
    521.44x = 315,776.82
  5. Step 5: Solve for x
    x = 315,776.82/521.44
  6. Step 6: Final answer
    x = 605.59

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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.