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Finding the Fourth Proportional to 1,192.24, 1,640.10 and 994.60

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Solution

The fourth proportional to 1,192.24, 1,640.10 and 994.60 is: 1,368.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,192.24 : 1,640.10 = 994.60 : x
  2. Step 2: Convert to fraction form
    1,192.24/1,640.10 = 994.60/x
  3. Step 3: Cross multiply
    1,192.24x = 1,640.10 × 994.60
  4. Step 4: Simplify right side
    1,192.24x = 1,631,243.46
  5. Step 5: Solve for x
    x = 1,631,243.46/1,192.24
  6. Step 6: Final answer
    x = 1,368.22

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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.