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Finding the Fourth Proportional to 479.25, 661.37 and 282.89

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Solution

The fourth proportional to 479.25, 661.37 and 282.89 is: 390.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.25 : 661.37 = 282.89 : x
  2. Step 2: Convert to fraction form
    479.25/661.37 = 282.89/x
  3. Step 3: Cross multiply
    479.25x = 661.37 × 282.89
  4. Step 4: Simplify right side
    479.25x = 187,095.20
  5. Step 5: Solve for x
    x = 187,095.20/479.25
  6. Step 6: Final answer
    x = 390.39

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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.