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Finding the Fourth Proportional to 21,976.80, 33,013.76 and 13,216.80

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Solution

The fourth proportional to 21,976.80, 33,013.76 and 13,216.80 is: 19,854.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,976.80 : 33,013.76 = 13,216.80 : x
  2. Step 2: Convert to fraction form
    21,976.80/33,013.76 = 13,216.80/x
  3. Step 3: Cross multiply
    21,976.80x = 33,013.76 × 13,216.80
  4. Step 4: Simplify right side
    21,976.80x = 436,336,263.17
  5. Step 5: Solve for x
    x = 436,336,263.17/21,976.80
  6. Step 6: Final answer
    x = 19,854.40

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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.