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Finding the Fourth Proportional to 1,206.64, 1,665.24 and 838

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Solution

The fourth proportional to 1,206.64, 1,665.24 and 838 is: 1,156.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.64 : 1,665.24 = 838 : x
  2. Step 2: Convert to fraction form
    1,206.64/1,665.24 = 838/x
  3. Step 3: Cross multiply
    1,206.64x = 1,665.24 × 838
  4. Step 4: Simplify right side
    1,206.64x = 1,395,471.12
  5. Step 5: Solve for x
    x = 1,395,471.12/1,206.64
  6. Step 6: Final answer
    x = 1,156.49

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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.