Home / 18,989.12-28,485.12-5,137.92

Finding the Fourth Proportional to 18,989.12, 28,485.12 and 5,137.92

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Solution

The fourth proportional to 18,989.12, 28,485.12 and 5,137.92 is: 7,707.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.12 : 28,485.12 = 5,137.92 : x
  2. Step 2: Convert to fraction form
    18,989.12/28,485.12 = 5,137.92/x
  3. Step 3: Cross multiply
    18,989.12x = 28,485.12 × 5,137.92
  4. Step 4: Simplify right side
    18,989.12x = 146,354,267.75
  5. Step 5: Solve for x
    x = 146,354,267.75/18,989.12
  6. Step 6: Final answer
    x = 7,707.27

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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.