Home / 20,816.40-31,205.70-7,665.60

Finding the Fourth Proportional to 20,816.40, 31,205.70 and 7,665.60

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Solution

The fourth proportional to 20,816.40, 31,205.70 and 7,665.60 is: 11,491.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,816.40 : 31,205.70 = 7,665.60 : x
  2. Step 2: Convert to fraction form
    20,816.40/31,205.70 = 7,665.60/x
  3. Step 3: Cross multiply
    20,816.40x = 31,205.70 × 7,665.60
  4. Step 4: Simplify right side
    20,816.40x = 239,210,413.92
  5. Step 5: Solve for x
    x = 239,210,413.92/20,816.40
  6. Step 6: Final answer
    x = 11,491.44

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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.