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Finding the Fourth Proportional to 1,967.64, 2,715.38 and 1,221.22

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Solution

The fourth proportional to 1,967.64, 2,715.38 and 1,221.22 is: 1,685.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,967.64 : 2,715.38 = 1,221.22 : x
  2. Step 2: Convert to fraction form
    1,967.64/2,715.38 = 1,221.22/x
  3. Step 3: Cross multiply
    1,967.64x = 2,715.38 × 1,221.22
  4. Step 4: Simplify right side
    1,967.64x = 3,316,076.36
  5. Step 5: Solve for x
    x = 3,316,076.36/1,967.64
  6. Step 6: Final answer
    x = 1,685.31

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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.