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Finding the Fourth Proportional to 905.31, 1,357.49 and 418.70

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Solution

The fourth proportional to 905.31, 1,357.49 and 418.70 is: 627.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.31 : 1,357.49 = 418.70 : x
  2. Step 2: Convert to fraction form
    905.31/1,357.49 = 418.70/x
  3. Step 3: Cross multiply
    905.31x = 1,357.49 × 418.70
  4. Step 4: Simplify right side
    905.31x = 568,385.50
  5. Step 5: Solve for x
    x = 568,385.50/905.31
  6. Step 6: Final answer
    x = 627.84

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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.