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Finding the Fourth Proportional to 479.21, 661.15 and 269.35

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Solution

The fourth proportional to 479.21, 661.15 and 269.35 is: 371.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.21 : 661.15 = 269.35 : x
  2. Step 2: Convert to fraction form
    479.21/661.15 = 269.35/x
  3. Step 3: Cross multiply
    479.21x = 661.15 × 269.35
  4. Step 4: Simplify right side
    479.21x = 178,080.75
  5. Step 5: Solve for x
    x = 178,080.75/479.21
  6. Step 6: Final answer
    x = 371.61

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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.