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Finding the Fourth Proportional to 905.87, 1,356.68 and 442.20

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Solution

The fourth proportional to 905.87, 1,356.68 and 442.20 is: 662.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.87 : 1,356.68 = 442.20 : x
  2. Step 2: Convert to fraction form
    905.87/1,356.68 = 442.20/x
  3. Step 3: Cross multiply
    905.87x = 1,356.68 × 442.20
  4. Step 4: Simplify right side
    905.87x = 599,921.69
  5. Step 5: Solve for x
    x = 599,921.69/905.87
  6. Step 6: Final answer
    x = 662.26

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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.