Home / 18,928.08-28,392.12-11,988

Finding the Fourth Proportional to 18,928.08, 28,392.12 and 11,988

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Solution

The fourth proportional to 18,928.08, 28,392.12 and 11,988 is: 17,982

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,928.08 : 28,392.12 = 11,988 : x
  2. Step 2: Convert to fraction form
    18,928.08/28,392.12 = 11,988/x
  3. Step 3: Cross multiply
    18,928.08x = 28,392.12 × 11,988
  4. Step 4: Simplify right side
    18,928.08x = 340,364,734.56
  5. Step 5: Solve for x
    x = 340,364,734.56/18,928.08
  6. Step 6: Final answer
    x = 17,982

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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.