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Finding the Fourth Proportional to 905.01, 1,357.43 and 418.05

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Solution

The fourth proportional to 905.01, 1,357.43 and 418.05 is: 627.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.01 : 1,357.43 = 418.05 : x
  2. Step 2: Convert to fraction form
    905.01/1,357.43 = 418.05/x
  3. Step 3: Cross multiply
    905.01x = 1,357.43 × 418.05
  4. Step 4: Simplify right side
    905.01x = 567,471.52
  5. Step 5: Solve for x
    x = 567,471.52/905.01
  6. Step 6: Final answer
    x = 627.03

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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.