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Finding the Fourth Proportional to 905.56, 1,247.94 and 864.28

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Solution

The fourth proportional to 905.56, 1,247.94 and 864.28 is: 1,191.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.56 : 1,247.94 = 864.28 : x
  2. Step 2: Convert to fraction form
    905.56/1,247.94 = 864.28/x
  3. Step 3: Cross multiply
    905.56x = 1,247.94 × 864.28
  4. Step 4: Simplify right side
    905.56x = 1,078,569.58
  5. Step 5: Solve for x
    x = 1,078,569.58/905.56
  6. Step 6: Final answer
    x = 1,191.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.