Home / 11,921.81-16,440.66-7,140.99

Finding the Fourth Proportional to 11,921.81, 16,440.66 and 7,140.99

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Solution

The fourth proportional to 11,921.81, 16,440.66 and 7,140.99 is: 9,847.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,921.81 : 16,440.66 = 7,140.99 : x
  2. Step 2: Convert to fraction form
    11,921.81/16,440.66 = 7,140.99/x
  3. Step 3: Cross multiply
    11,921.81x = 16,440.66 × 7,140.99
  4. Step 4: Simplify right side
    11,921.81x = 117,402,588.65
  5. Step 5: Solve for x
    x = 117,402,588.65/11,921.81
  6. Step 6: Final answer
    x = 9,847.71

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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.