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Finding the Fourth Proportional to 938.54, 1,406.86 and 418.81

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Solution

The fourth proportional to 938.54, 1,406.86 and 418.81 is: 627.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.54 : 1,406.86 = 418.81 : x
  2. Step 2: Convert to fraction form
    938.54/1,406.86 = 418.81/x
  3. Step 3: Cross multiply
    938.54x = 1,406.86 × 418.81
  4. Step 4: Simplify right side
    938.54x = 589,202.47
  5. Step 5: Solve for x
    x = 589,202.47/938.54
  6. Step 6: Final answer
    x = 627.79

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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.