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Finding the Fourth Proportional to 18,840, 28,260 and 4,990.08

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Solution

The fourth proportional to 18,840, 28,260 and 4,990.08 is: 7,485.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,840 : 28,260 = 4,990.08 : x
  2. Step 2: Convert to fraction form
    18,840/28,260 = 4,990.08/x
  3. Step 3: Cross multiply
    18,840x = 28,260 × 4,990.08
  4. Step 4: Simplify right side
    18,840x = 141,019,660.80
  5. Step 5: Solve for x
    x = 141,019,660.80/18,840
  6. Step 6: Final answer
    x = 7,485.12

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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.