Home / 12,128.49-18,201.09-4,231.05

Finding the Fourth Proportional to 12,128.49, 18,201.09 and 4,231.05

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Solution

The fourth proportional to 12,128.49, 18,201.09 and 4,231.05 is: 6,349.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,128.49 : 18,201.09 = 4,231.05 : x
  2. Step 2: Convert to fraction form
    12,128.49/18,201.09 = 4,231.05/x
  3. Step 3: Cross multiply
    12,128.49x = 18,201.09 × 4,231.05
  4. Step 4: Simplify right side
    12,128.49x = 77,009,721.84
  5. Step 5: Solve for x
    x = 77,009,721.84/12,128.49
  6. Step 6: Final answer
    x = 6,349.49

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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.