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Finding the Fourth Proportional to 14,679.78, 20,257.74 and 8,391.75

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Solution

The fourth proportional to 14,679.78, 20,257.74 and 8,391.75 is: 11,580.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,679.78 : 20,257.74 = 8,391.75 : x
  2. Step 2: Convert to fraction form
    14,679.78/20,257.74 = 8,391.75/x
  3. Step 3: Cross multiply
    14,679.78x = 20,257.74 × 8,391.75
  4. Step 4: Simplify right side
    14,679.78x = 169,997,889.65
  5. Step 5: Solve for x
    x = 169,997,889.65/14,679.78
  6. Step 6: Final answer
    x = 11,580.41

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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.