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Finding the Fourth Proportional to 2,013.72, 3,021.04 and 781.14

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Solution

The fourth proportional to 2,013.72, 3,021.04 and 781.14 is: 1,171.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,013.72 : 3,021.04 = 781.14 : x
  2. Step 2: Convert to fraction form
    2,013.72/3,021.04 = 781.14/x
  3. Step 3: Cross multiply
    2,013.72x = 3,021.04 × 781.14
  4. Step 4: Simplify right side
    2,013.72x = 2,359,855.19
  5. Step 5: Solve for x
    x = 2,359,855.19/2,013.72
  6. Step 6: Final answer
    x = 1,171.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.