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Finding the Fourth Proportional to 2,167.08, 2,990.49 and 1,222.90

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Solution

The fourth proportional to 2,167.08, 2,990.49 and 1,222.90 is: 1,687.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,167.08 : 2,990.49 = 1,222.90 : x
  2. Step 2: Convert to fraction form
    2,167.08/2,990.49 = 1,222.90/x
  3. Step 3: Cross multiply
    2,167.08x = 2,990.49 × 1,222.90
  4. Step 4: Simplify right side
    2,167.08x = 3,657,068.48
  5. Step 5: Solve for x
    x = 3,657,068.48/2,167.08
  6. Step 6: Final answer
    x = 1,687.56

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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.