Home / 20,989.85-31,320.33-18,783.41

Finding the Fourth Proportional to 20,989.85, 31,320.33 and 18,783.41

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Solution

The fourth proportional to 20,989.85, 31,320.33 and 18,783.41 is: 28,027.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.85 : 31,320.33 = 18,783.41 : x
  2. Step 2: Convert to fraction form
    20,989.85/31,320.33 = 18,783.41/x
  3. Step 3: Cross multiply
    20,989.85x = 31,320.33 × 18,783.41
  4. Step 4: Simplify right side
    20,989.85x = 588,302,372.69
  5. Step 5: Solve for x
    x = 588,302,372.69/20,989.85
  6. Step 6: Final answer
    x = 28,027.95

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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.