Home / 20,945.40-28,911.40-13,412.03

Finding the Fourth Proportional to 20,945.40, 28,911.40 and 13,412.03

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Solution

The fourth proportional to 20,945.40, 28,911.40 and 13,412.03 is: 18,512.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,945.40 : 28,911.40 = 13,412.03 : x
  2. Step 2: Convert to fraction form
    20,945.40/28,911.40 = 13,412.03/x
  3. Step 3: Cross multiply
    20,945.40x = 28,911.40 × 13,412.03
  4. Step 4: Simplify right side
    20,945.40x = 387,760,424.80
  5. Step 5: Solve for x
    x = 387,760,424.80/20,945.40
  6. Step 6: Final answer
    x = 18,512.92

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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.