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Finding the Fourth Proportional to 905.38, 1,356.56 and 644.08

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Solution

The fourth proportional to 905.38, 1,356.56 and 644.08 is: 965.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.38 : 1,356.56 = 644.08 : x
  2. Step 2: Convert to fraction form
    905.38/1,356.56 = 644.08/x
  3. Step 3: Cross multiply
    905.38x = 1,356.56 × 644.08
  4. Step 4: Simplify right side
    905.38x = 873,733.16
  5. Step 5: Solve for x
    x = 873,733.16/905.38
  6. Step 6: Final answer
    x = 965.05

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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.