Home / 20,129.81-27,778.60-11,177.08

Finding the Fourth Proportional to 20,129.81, 27,778.60 and 11,177.08

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Solution

The fourth proportional to 20,129.81, 27,778.60 and 11,177.08 is: 15,424.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,129.81 : 27,778.60 = 11,177.08 : x
  2. Step 2: Convert to fraction form
    20,129.81/27,778.60 = 11,177.08/x
  3. Step 3: Cross multiply
    20,129.81x = 27,778.60 × 11,177.08
  4. Step 4: Simplify right side
    20,129.81x = 310,483,634.49
  5. Step 5: Solve for x
    x = 310,483,634.49/20,129.81
  6. Step 6: Final answer
    x = 15,424.07

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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.