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Finding the Fourth Proportional to 21,976.96, 30,328.32 and 12,040.96

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Solution

The fourth proportional to 21,976.96, 30,328.32 and 12,040.96 is: 16,616.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,976.96 : 30,328.32 = 12,040.96 : x
  2. Step 2: Convert to fraction form
    21,976.96/30,328.32 = 12,040.96/x
  3. Step 3: Cross multiply
    21,976.96x = 30,328.32 × 12,040.96
  4. Step 4: Simplify right side
    21,976.96x = 365,182,087.99
  5. Step 5: Solve for x
    x = 365,182,087.99/21,976.96
  6. Step 6: Final answer
    x = 16,616.59

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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.