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Finding the Fourth Proportional to 621.10, 930.63 and 438.11

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Solution

The fourth proportional to 621.10, 930.63 and 438.11 is: 656.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.10 : 930.63 = 438.11 : x
  2. Step 2: Convert to fraction form
    621.10/930.63 = 438.11/x
  3. Step 3: Cross multiply
    621.10x = 930.63 × 438.11
  4. Step 4: Simplify right side
    621.10x = 407,716.12
  5. Step 5: Solve for x
    x = 407,716.12/621.10
  6. Step 6: Final answer
    x = 656.44

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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.