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Finding the Fourth Proportional to 938.44, 1,407.86 and 418.24

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Solution

The fourth proportional to 938.44, 1,407.86 and 418.24 is: 627.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.44 : 1,407.86 = 418.24 : x
  2. Step 2: Convert to fraction form
    938.44/1,407.86 = 418.24/x
  3. Step 3: Cross multiply
    938.44x = 1,407.86 × 418.24
  4. Step 4: Simplify right side
    938.44x = 588,823.37
  5. Step 5: Solve for x
    x = 588,823.37/938.44
  6. Step 6: Final answer
    x = 627.45

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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.