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Finding the Fourth Proportional to 14,081.78, 21,128.93 and 7,416.65

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Solution

The fourth proportional to 14,081.78, 21,128.93 and 7,416.65 is: 11,128.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,081.78 : 21,128.93 = 7,416.65 : x
  2. Step 2: Convert to fraction form
    14,081.78/21,128.93 = 7,416.65/x
  3. Step 3: Cross multiply
    14,081.78x = 21,128.93 × 7,416.65
  4. Step 4: Simplify right side
    14,081.78x = 156,705,735.96
  5. Step 5: Solve for x
    x = 156,705,735.96/14,081.78
  6. Step 6: Final answer
    x = 11,128.27

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1.5x scale

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.