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Finding the Fourth Proportional to 479.28, 661.63 and 361.30

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Solution

The fourth proportional to 479.28, 661.63 and 361.30 is: 498.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.28 : 661.63 = 361.30 : x
  2. Step 2: Convert to fraction form
    479.28/661.63 = 361.30/x
  3. Step 3: Cross multiply
    479.28x = 661.63 × 361.30
  4. Step 4: Simplify right side
    479.28x = 239,049.81
  5. Step 5: Solve for x
    x = 239,049.81/479.28
  6. Step 6: Final answer
    x = 498.77

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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.