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Finding the Fourth Proportional to 905.14, 1,356.79 and 357.11

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Solution

The fourth proportional to 905.14, 1,356.79 and 357.11 is: 535.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.14 : 1,356.79 = 357.11 : x
  2. Step 2: Convert to fraction form
    905.14/1,356.79 = 357.11/x
  3. Step 3: Cross multiply
    905.14x = 1,356.79 × 357.11
  4. Step 4: Simplify right side
    905.14x = 484,523.28
  5. Step 5: Solve for x
    x = 484,523.28/905.14
  6. Step 6: Final answer
    x = 535.30

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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.