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Finding the Fourth Proportional to 21,989.80, 30,873.20 and 21,989.80

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Solution

The fourth proportional to 21,989.80, 30,873.20 and 21,989.80 is: 30,873.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,989.80 : 30,873.20 = 21,989.80 : x
  2. Step 2: Convert to fraction form
    21,989.80/30,873.20 = 21,989.80/x
  3. Step 3: Cross multiply
    21,989.80x = 30,873.20 × 21,989.80
  4. Step 4: Simplify right side
    21,989.80x = 678,895,493.36
  5. Step 5: Solve for x
    x = 678,895,493.36/21,989.80
  6. Step 6: Final answer
    x = 30,873.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.