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Finding the Fourth Proportional to 479.11, 661.08 and 282.55

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Solution

The fourth proportional to 479.11, 661.08 and 282.55 is: 389.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.11 : 661.08 = 282.55 : x
  2. Step 2: Convert to fraction form
    479.11/661.08 = 282.55/x
  3. Step 3: Cross multiply
    479.11x = 661.08 × 282.55
  4. Step 4: Simplify right side
    479.11x = 186,788.15
  5. Step 5: Solve for x
    x = 186,788.15/479.11
  6. Step 6: Final answer
    x = 389.86

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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.