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Finding the Fourth Proportional to 479.30, 661.41 and 282.77

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Solution

The fourth proportional to 479.30, 661.41 and 282.77 is: 390.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.30 : 661.41 = 282.77 : x
  2. Step 2: Convert to fraction form
    479.30/661.41 = 282.77/x
  3. Step 3: Cross multiply
    479.30x = 661.41 × 282.77
  4. Step 4: Simplify right side
    479.30x = 187,028.56
  5. Step 5: Solve for x
    x = 187,028.56/479.30
  6. Step 6: Final answer
    x = 390.21

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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.