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Finding the Fourth Proportional to 15,753.47, 21,739.84 and 8,679.89

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Solution

The fourth proportional to 15,753.47, 21,739.84 and 8,679.89 is: 11,978.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,753.47 : 21,739.84 = 8,679.89 : x
  2. Step 2: Convert to fraction form
    15,753.47/21,739.84 = 8,679.89/x
  3. Step 3: Cross multiply
    15,753.47x = 21,739.84 × 8,679.89
  4. Step 4: Simplify right side
    15,753.47x = 188,699,289.42
  5. Step 5: Solve for x
    x = 188,699,289.42/15,753.47
  6. Step 6: Final answer
    x = 11,978.27

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1.5x scale

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.