Home / 12,189.51-18,285.78-4,290.16

Finding the Fourth Proportional to 12,189.51, 18,285.78 and 4,290.16

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Solution

The fourth proportional to 12,189.51, 18,285.78 and 4,290.16 is: 6,435.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,189.51 : 18,285.78 = 4,290.16 : x
  2. Step 2: Convert to fraction form
    12,189.51/18,285.78 = 4,290.16/x
  3. Step 3: Cross multiply
    12,189.51x = 18,285.78 × 4,290.16
  4. Step 4: Simplify right side
    12,189.51x = 78,448,921.92
  5. Step 5: Solve for x
    x = 78,448,921.92/12,189.51
  6. Step 6: Final answer
    x = 6,435.77

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Similar ratio
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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.