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Finding the Fourth Proportional to 660.94, 991.31 and 222.19

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Solution

The fourth proportional to 660.94, 991.31 and 222.19 is: 333.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.94 : 991.31 = 222.19 : x
  2. Step 2: Convert to fraction form
    660.94/991.31 = 222.19/x
  3. Step 3: Cross multiply
    660.94x = 991.31 × 222.19
  4. Step 4: Simplify right side
    660.94x = 220,259.17
  5. Step 5: Solve for x
    x = 220,259.17/660.94
  6. Step 6: Final answer
    x = 333.25

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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.