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Finding the Fourth Proportional to 439.55, 659.86 and 205.51

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Solution

The fourth proportional to 439.55, 659.86 and 205.51 is: 308.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.55 : 659.86 = 205.51 : x
  2. Step 2: Convert to fraction form
    439.55/659.86 = 205.51/x
  3. Step 3: Cross multiply
    439.55x = 659.86 × 205.51
  4. Step 4: Simplify right side
    439.55x = 135,607.83
  5. Step 5: Solve for x
    x = 135,607.83/439.55
  6. Step 6: Final answer
    x = 308.52

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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.