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Finding the Fourth Proportional to 21,065.78, 31,601.91 and 7,919.08

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Solution

The fourth proportional to 21,065.78, 31,601.91 and 7,919.08 is: 11,879.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,065.78 : 31,601.91 = 7,919.08 : x
  2. Step 2: Convert to fraction form
    21,065.78/31,601.91 = 7,919.08/x
  3. Step 3: Cross multiply
    21,065.78x = 31,601.91 × 7,919.08
  4. Step 4: Simplify right side
    21,065.78x = 250,258,004.13
  5. Step 5: Solve for x
    x = 250,258,004.13/21,065.78
  6. Step 6: Final answer
    x = 11,879.83

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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.