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Finding the Fourth Proportional to 1,620.74, 2,236.63 and 922.16

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Solution

The fourth proportional to 1,620.74, 2,236.63 and 922.16 is: 1,272.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.74 : 2,236.63 = 922.16 : x
  2. Step 2: Convert to fraction form
    1,620.74/2,236.63 = 922.16/x
  3. Step 3: Cross multiply
    1,620.74x = 2,236.63 × 922.16
  4. Step 4: Simplify right side
    1,620.74x = 2,062,517.23
  5. Step 5: Solve for x
    x = 2,062,517.23/1,620.74
  6. Step 6: Final answer
    x = 1,272.58

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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.