Home / 20,785.80-31,178.70-13,009.80

Finding the Fourth Proportional to 20,785.80, 31,178.70 and 13,009.80

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Solution

The fourth proportional to 20,785.80, 31,178.70 and 13,009.80 is: 19,514.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,785.80 : 31,178.70 = 13,009.80 : x
  2. Step 2: Convert to fraction form
    20,785.80/31,178.70 = 13,009.80/x
  3. Step 3: Cross multiply
    20,785.80x = 31,178.70 × 13,009.80
  4. Step 4: Simplify right side
    20,785.80x = 405,628,651.26
  5. Step 5: Solve for x
    x = 405,628,651.26/20,785.80
  6. Step 6: Final answer
    x = 19,514.70

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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.