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Finding the Fourth Proportional to 21,989.40, 33,008.40 and 13,678.80

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Solution

The fourth proportional to 21,989.40, 33,008.40 and 13,678.80 is: 20,533.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,989.40 : 33,008.40 = 13,678.80 : x
  2. Step 2: Convert to fraction form
    21,989.40/33,008.40 = 13,678.80/x
  3. Step 3: Cross multiply
    21,989.40x = 33,008.40 × 13,678.80
  4. Step 4: Simplify right side
    21,989.40x = 451,515,301.92
  5. Step 5: Solve for x
    x = 451,515,301.92/21,989.40
  6. Step 6: Final answer
    x = 20,533.32

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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.