Home / 20,905.20-31,181.58-19,453.68

Finding the Fourth Proportional to 20,905.20, 31,181.58 and 19,453.68

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Solution

The fourth proportional to 20,905.20, 31,181.58 and 19,453.68 is: 29,016.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.20 : 31,181.58 = 19,453.68 : x
  2. Step 2: Convert to fraction form
    20,905.20/31,181.58 = 19,453.68/x
  3. Step 3: Cross multiply
    20,905.20x = 31,181.58 × 19,453.68
  4. Step 4: Simplify right side
    20,905.20x = 606,596,479.21
  5. Step 5: Solve for x
    x = 606,596,479.21/20,905.20
  6. Step 6: Final answer
    x = 29,016.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.