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Finding the Fourth Proportional to 21,990.40, 33,007.20 and 10,909.60

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Solution

The fourth proportional to 21,990.40, 33,007.20 and 10,909.60 is: 16,375.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.40 : 33,007.20 = 10,909.60 : x
  2. Step 2: Convert to fraction form
    21,990.40/33,007.20 = 10,909.60/x
  3. Step 3: Cross multiply
    21,990.40x = 33,007.20 × 10,909.60
  4. Step 4: Simplify right side
    21,990.40x = 360,095,349.12
  5. Step 5: Solve for x
    x = 360,095,349.12/21,990.40
  6. Step 6: Final answer
    x = 16,375.12

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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.