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Finding the Fourth Proportional to 21,930.40, 32,809.20 and 19,040.80

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Solution

The fourth proportional to 21,930.40, 32,809.20 and 19,040.80 is: 28,486.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,930.40 : 32,809.20 = 19,040.80 : x
  2. Step 2: Convert to fraction form
    21,930.40/32,809.20 = 19,040.80/x
  3. Step 3: Cross multiply
    21,930.40x = 32,809.20 × 19,040.80
  4. Step 4: Simplify right side
    21,930.40x = 624,713,415.36
  5. Step 5: Solve for x
    x = 624,713,415.36/21,930.40
  6. Step 6: Final answer
    x = 28,486.18

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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.