Home / 20,971.87-31,405.21-12,533.18

Finding the Fourth Proportional to 20,971.87, 31,405.21 and 12,533.18

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Solution

The fourth proportional to 20,971.87, 31,405.21 and 12,533.18 is: 18,768.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.87 : 31,405.21 = 12,533.18 : x
  2. Step 2: Convert to fraction form
    20,971.87/31,405.21 = 12,533.18/x
  3. Step 3: Cross multiply
    20,971.87x = 31,405.21 × 12,533.18
  4. Step 4: Simplify right side
    20,971.87x = 393,606,961.51
  5. Step 5: Solve for x
    x = 393,606,961.51/20,971.87
  6. Step 6: Final answer
    x = 18,768.33

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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.