Home / 20,486.78-30,744.75-15,811.46

Finding the Fourth Proportional to 20,486.78, 30,744.75 and 15,811.46

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Solution

The fourth proportional to 20,486.78, 30,744.75 and 15,811.46 is: 23,728.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,486.78 : 30,744.75 = 15,811.46 : x
  2. Step 2: Convert to fraction form
    20,486.78/30,744.75 = 15,811.46/x
  3. Step 3: Cross multiply
    20,486.78x = 30,744.75 × 15,811.46
  4. Step 4: Simplify right side
    20,486.78x = 486,119,384.84
  5. Step 5: Solve for x
    x = 486,119,384.84/20,486.78
  6. Step 6: Final answer
    x = 23,728.44

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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.