Home / 20,905.48-28,839.81-12,944.80

Finding the Fourth Proportional to 20,905.48, 28,839.81 and 12,944.80

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Solution

The fourth proportional to 20,905.48, 28,839.81 and 12,944.80 is: 17,857.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.48 : 28,839.81 = 12,944.80 : x
  2. Step 2: Convert to fraction form
    20,905.48/28,839.81 = 12,944.80/x
  3. Step 3: Cross multiply
    20,905.48x = 28,839.81 × 12,944.80
  4. Step 4: Simplify right side
    20,905.48x = 373,325,572.49
  5. Step 5: Solve for x
    x = 373,325,572.49/20,905.48
  6. Step 6: Final answer
    x = 17,857.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.