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Finding the Fourth Proportional to 905.72, 1,356.46 and 661.64

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Solution

The fourth proportional to 905.72, 1,356.46 and 661.64 is: 990.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.72 : 1,356.46 = 661.64 : x
  2. Step 2: Convert to fraction form
    905.72/1,356.46 = 661.64/x
  3. Step 3: Cross multiply
    905.72x = 1,356.46 × 661.64
  4. Step 4: Simplify right side
    905.72x = 897,488.19
  5. Step 5: Solve for x
    x = 897,488.19/905.72
  6. Step 6: Final answer
    x = 990.91

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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.