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Finding the Fourth Proportional to 18,990.86, 28,480.80 and 7,301.30

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Solution

The fourth proportional to 18,990.86, 28,480.80 and 7,301.30 is: 10,949.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.86 : 28,480.80 = 7,301.30 : x
  2. Step 2: Convert to fraction form
    18,990.86/28,480.80 = 7,301.30/x
  3. Step 3: Cross multiply
    18,990.86x = 28,480.80 × 7,301.30
  4. Step 4: Simplify right side
    18,990.86x = 207,946,865.04
  5. Step 5: Solve for x
    x = 207,946,865.04/18,990.86
  6. Step 6: Final answer
    x = 10,949.84

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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.