Home / 20,816.75-31,208.72-7,661.94

Finding the Fourth Proportional to 20,816.75, 31,208.72 and 7,661.94

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Solution

The fourth proportional to 20,816.75, 31,208.72 and 7,661.94 is: 11,486.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,816.75 : 31,208.72 = 7,661.94 : x
  2. Step 2: Convert to fraction form
    20,816.75/31,208.72 = 7,661.94/x
  3. Step 3: Cross multiply
    20,816.75x = 31,208.72 × 7,661.94
  4. Step 4: Simplify right side
    20,816.75x = 239,119,301.81
  5. Step 5: Solve for x
    x = 239,119,301.81/20,816.75
  6. Step 6: Final answer
    x = 11,486.87

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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.