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Finding the Fourth Proportional to 2,536.72, 3,805.45 and 781.87

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Solution

The fourth proportional to 2,536.72, 3,805.45 and 781.87 is: 1,172.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,536.72 : 3,805.45 = 781.87 : x
  2. Step 2: Convert to fraction form
    2,536.72/3,805.45 = 781.87/x
  3. Step 3: Cross multiply
    2,536.72x = 3,805.45 × 781.87
  4. Step 4: Simplify right side
    2,536.72x = 2,975,367.19
  5. Step 5: Solve for x
    x = 2,975,367.19/2,536.72
  6. Step 6: Final answer
    x = 1,172.92

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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.