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Finding the Fourth Proportional to 18,992.79, 28,489.95 and 7,145.37

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Solution

The fourth proportional to 18,992.79, 28,489.95 and 7,145.37 is: 10,718.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,992.79 : 28,489.95 = 7,145.37 : x
  2. Step 2: Convert to fraction form
    18,992.79/28,489.95 = 7,145.37/x
  3. Step 3: Cross multiply
    18,992.79x = 28,489.95 × 7,145.37
  4. Step 4: Simplify right side
    18,992.79x = 203,571,234.03
  5. Step 5: Solve for x
    x = 203,571,234.03/18,992.79
  6. Step 6: Final answer
    x = 10,718.34

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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.