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Finding the Fourth Proportional to 35,679.91, 53,519.99 and 11,986.78

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Solution

The fourth proportional to 35,679.91, 53,519.99 and 11,986.78 is: 17,980.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    35,679.91 : 53,519.99 = 11,986.78 : x
  2. Step 2: Convert to fraction form
    35,679.91/53,519.99 = 11,986.78/x
  3. Step 3: Cross multiply
    35,679.91x = 53,519.99 × 11,986.78
  4. Step 4: Simplify right side
    35,679.91x = 641,532,345.73
  5. Step 5: Solve for x
    x = 641,532,345.73/35,679.91
  6. Step 6: Final answer
    x = 17,980.21

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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.