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Finding the Fourth Proportional to 2,102.67, 2,902.67 and 1,218.31

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Solution

The fourth proportional to 2,102.67, 2,902.67 and 1,218.31 is: 1,681.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,102.67 : 2,902.67 = 1,218.31 : x
  2. Step 2: Convert to fraction form
    2,102.67/2,902.67 = 1,218.31/x
  3. Step 3: Cross multiply
    2,102.67x = 2,902.67 × 1,218.31
  4. Step 4: Simplify right side
    2,102.67x = 3,536,343.11
  5. Step 5: Solve for x
    x = 3,536,343.11/2,102.67
  6. Step 6: Final answer
    x = 1,681.83

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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.