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Finding the Fourth Proportional to 905.00, 1,247.94 and 695.21

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Solution

The fourth proportional to 905.00, 1,247.94 and 695.21 is: 958.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.00 : 1,247.94 = 695.21 : x
  2. Step 2: Convert to fraction form
    905.00/1,247.94 = 695.21/x
  3. Step 3: Cross multiply
    905.00x = 1,247.94 × 695.21
  4. Step 4: Simplify right side
    905.00x = 867,574.13
  5. Step 5: Solve for x
    x = 867,574.13/905.00
  6. Step 6: Final answer
    x = 958.65

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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.