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Finding the Fourth Proportional to 21,779.56, 32,669.22 and 7,928.56

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Solution

The fourth proportional to 21,779.56, 32,669.22 and 7,928.56 is: 11,892.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,779.56 : 32,669.22 = 7,928.56 : x
  2. Step 2: Convert to fraction form
    21,779.56/32,669.22 = 7,928.56/x
  3. Step 3: Cross multiply
    21,779.56x = 32,669.22 × 7,928.56
  4. Step 4: Simplify right side
    21,779.56x = 259,019,870.92
  5. Step 5: Solve for x
    x = 259,019,870.92/21,779.56
  6. Step 6: Final answer
    x = 11,892.80

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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.