Home / 20,331.21-30,448.19-12,912.45

Finding the Fourth Proportional to 20,331.21, 30,448.19 and 12,912.45

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Solution

The fourth proportional to 20,331.21, 30,448.19 and 12,912.45 is: 19,337.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,331.21 : 30,448.19 = 12,912.45 : x
  2. Step 2: Convert to fraction form
    20,331.21/30,448.19 = 12,912.45/x
  3. Step 3: Cross multiply
    20,331.21x = 30,448.19 × 12,912.45
  4. Step 4: Simplify right side
    20,331.21x = 393,160,666.40
  5. Step 5: Solve for x
    x = 393,160,666.40/20,331.21
  6. Step 6: Final answer
    x = 19,337.79

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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.