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Finding the Fourth Proportional to 439.72, 659.51 and 131.56

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Solution

The fourth proportional to 439.72, 659.51 and 131.56 is: 197.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.72 : 659.51 = 131.56 : x
  2. Step 2: Convert to fraction form
    439.72/659.51 = 131.56/x
  3. Step 3: Cross multiply
    439.72x = 659.51 × 131.56
  4. Step 4: Simplify right side
    439.72x = 86,763.82
  5. Step 5: Solve for x
    x = 86,763.82/439.72
  6. Step 6: Final answer
    x = 197.32

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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.