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Finding the Fourth Proportional to 938.58, 1,407.96 and 418.56

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Solution

The fourth proportional to 938.58, 1,407.96 and 418.56 is: 627.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.58 : 1,407.96 = 418.56 : x
  2. Step 2: Convert to fraction form
    938.58/1,407.96 = 418.56/x
  3. Step 3: Cross multiply
    938.58x = 1,407.96 × 418.56
  4. Step 4: Simplify right side
    938.58x = 589,315.74
  5. Step 5: Solve for x
    x = 589,315.74/938.58
  6. Step 6: Final answer
    x = 627.88

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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.