Home / 12,667.78-18,908.90-11,171.47

Finding the Fourth Proportional to 12,667.78, 18,908.90 and 11,171.47

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Solution

The fourth proportional to 12,667.78, 18,908.90 and 11,171.47 is: 16,675.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,667.78 : 18,908.90 = 11,171.47 : x
  2. Step 2: Convert to fraction form
    12,667.78/18,908.90 = 11,171.47/x
  3. Step 3: Cross multiply
    12,667.78x = 18,908.90 × 11,171.47
  4. Step 4: Simplify right side
    12,667.78x = 211,240,058.68
  5. Step 5: Solve for x
    x = 211,240,058.68/12,667.78
  6. Step 6: Final answer
    x = 16,675.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.