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Finding the Fourth Proportional to 2,167.96, 2,991.80 and 1,223.98

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Solution

The fourth proportional to 2,167.96, 2,991.80 and 1,223.98 is: 1,689.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,167.96 : 2,991.80 = 1,223.98 : x
  2. Step 2: Convert to fraction form
    2,167.96/2,991.80 = 1,223.98/x
  3. Step 3: Cross multiply
    2,167.96x = 2,991.80 × 1,223.98
  4. Step 4: Simplify right side
    2,167.96x = 3,661,903.36
  5. Step 5: Solve for x
    x = 3,661,903.36/2,167.96
  6. Step 6: Final answer
    x = 1,689.10

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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.