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Finding the Fourth Proportional to 15,392.50, 21,243.72 and 8,679.49

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Solution

The fourth proportional to 15,392.50, 21,243.72 and 8,679.49 is: 11,978.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,392.50 : 21,243.72 = 8,679.49 : x
  2. Step 2: Convert to fraction form
    15,392.50/21,243.72 = 8,679.49/x
  3. Step 3: Cross multiply
    15,392.50x = 21,243.72 × 8,679.49
  4. Step 4: Simplify right side
    15,392.50x = 184,384,655.30
  5. Step 5: Solve for x
    x = 184,384,655.30/15,392.50
  6. Step 6: Final answer
    x = 11,978.86

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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.