Home / 12,189.78-16,821.81-6,885.63

Finding the Fourth Proportional to 12,189.78, 16,821.81 and 6,885.63

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Solution

The fourth proportional to 12,189.78, 16,821.81 and 6,885.63 is: 9,502.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,189.78 : 16,821.81 = 6,885.63 : x
  2. Step 2: Convert to fraction form
    12,189.78/16,821.81 = 6,885.63/x
  3. Step 3: Cross multiply
    12,189.78x = 16,821.81 × 6,885.63
  4. Step 4: Simplify right side
    12,189.78x = 115,828,759.59
  5. Step 5: Solve for x
    x = 115,828,759.59/12,189.78
  6. Step 6: Final answer
    x = 9,502.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.