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Finding the Fourth Proportional to 621.10, 931.11 and 361.09

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Solution

The fourth proportional to 621.10, 931.11 and 361.09 is: 541.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.10 : 931.11 = 361.09 : x
  2. Step 2: Convert to fraction form
    621.10/931.11 = 361.09/x
  3. Step 3: Cross multiply
    621.10x = 931.11 × 361.09
  4. Step 4: Simplify right side
    621.10x = 336,214.51
  5. Step 5: Solve for x
    x = 336,214.51/621.10
  6. Step 6: Final answer
    x = 541.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.