Home / 20,781.99-31,182.12-10,918.98

Finding the Fourth Proportional to 20,781.99, 31,182.12 and 10,918.98

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Solution

The fourth proportional to 20,781.99, 31,182.12 and 10,918.98 is: 16,383.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.99 : 31,182.12 = 10,918.98 : x
  2. Step 2: Convert to fraction form
    20,781.99/31,182.12 = 10,918.98/x
  3. Step 3: Cross multiply
    20,781.99x = 31,182.12 × 10,918.98
  4. Step 4: Simplify right side
    20,781.99x = 340,476,944.64
  5. Step 5: Solve for x
    x = 340,476,944.64/20,781.99
  6. Step 6: Final answer
    x = 16,383.27

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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.