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Finding the Fourth Proportional to 479.73, 661.76 and 283.21

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Solution

The fourth proportional to 479.73, 661.76 and 283.21 is: 390.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.73 : 661.76 = 283.21 : x
  2. Step 2: Convert to fraction form
    479.73/661.76 = 283.21/x
  3. Step 3: Cross multiply
    479.73x = 661.76 × 283.21
  4. Step 4: Simplify right side
    479.73x = 187,415.04
  5. Step 5: Solve for x
    x = 187,415.04/479.73
  6. Step 6: Final answer
    x = 390.66

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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.