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Finding the Fourth Proportional to 1,964.48, 2,709.96 and 1,218.20

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Solution

The fourth proportional to 1,964.48, 2,709.96 and 1,218.20 is: 1,680.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,964.48 : 2,709.96 = 1,218.20 : x
  2. Step 2: Convert to fraction form
    1,964.48/2,709.96 = 1,218.20/x
  3. Step 3: Cross multiply
    1,964.48x = 2,709.96 × 1,218.20
  4. Step 4: Simplify right side
    1,964.48x = 3,301,273.27
  5. Step 5: Solve for x
    x = 3,301,273.27/1,964.48
  6. Step 6: Final answer
    x = 1,680.48

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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.