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Finding the Fourth Proportional to 21,999.99, 30,360.38 and 11,928.77

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Solution

The fourth proportional to 21,999.99, 30,360.38 and 11,928.77 is: 16,461.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,999.99 : 30,360.38 = 11,928.77 : x
  2. Step 2: Convert to fraction form
    21,999.99/30,360.38 = 11,928.77/x
  3. Step 3: Cross multiply
    21,999.99x = 30,360.38 × 11,928.77
  4. Step 4: Simplify right side
    21,999.99x = 362,161,990.13
  5. Step 5: Solve for x
    x = 362,161,990.13/21,999.99
  6. Step 6: Final answer
    x = 16,461.92

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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.