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Finding the Fourth Proportional to 2,165.67, 2,988 and 1,221.41

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Solution

The fourth proportional to 2,165.67, 2,988 and 1,221.41 is: 1,685.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,165.67 : 2,988 = 1,221.41 : x
  2. Step 2: Convert to fraction form
    2,165.67/2,988 = 1,221.41/x
  3. Step 3: Cross multiply
    2,165.67x = 2,988 × 1,221.41
  4. Step 4: Simplify right side
    2,165.67x = 3,649,580.55
  5. Step 5: Solve for x
    x = 3,649,580.55/2,165.67
  6. Step 6: Final answer
    x = 1,685.20

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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.