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Finding the Fourth Proportional to 479.63, 661.89 and 283.25

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Solution

The fourth proportional to 479.63, 661.89 and 283.25 is: 390.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.63 : 661.89 = 283.25 : x
  2. Step 2: Convert to fraction form
    479.63/661.89 = 283.25/x
  3. Step 3: Cross multiply
    479.63x = 661.89 × 283.25
  4. Step 4: Simplify right side
    479.63x = 187,477.03
  5. Step 5: Solve for x
    x = 187,477.03/479.63
  6. Step 6: Final answer
    x = 390.88

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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.