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Finding the Fourth Proportional to 660.28, 911.15 and 361.51

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Solution

The fourth proportional to 660.28, 911.15 and 361.51 is: 498.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.28 : 911.15 = 361.51 : x
  2. Step 2: Convert to fraction form
    660.28/911.15 = 361.51/x
  3. Step 3: Cross multiply
    660.28x = 911.15 × 361.51
  4. Step 4: Simplify right side
    660.28x = 329,389.84
  5. Step 5: Solve for x
    x = 329,389.84/660.28
  6. Step 6: Final answer
    x = 498.86

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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.