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Finding the Fourth Proportional to 911.28, 1,355.27 and 901.56

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Solution

The fourth proportional to 911.28, 1,355.27 and 901.56 is: 1,340.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.28 : 1,355.27 = 901.56 : x
  2. Step 2: Convert to fraction form
    911.28/1,355.27 = 901.56/x
  3. Step 3: Cross multiply
    911.28x = 1,355.27 × 901.56
  4. Step 4: Simplify right side
    911.28x = 1,221,857.22
  5. Step 5: Solve for x
    x = 1,221,857.22/911.28
  6. Step 6: Final answer
    x = 1,340.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.