Home / 20,945.72-28,911.82-13,412.34

Finding the Fourth Proportional to 20,945.72, 28,911.82 and 13,412.34

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Solution

The fourth proportional to 20,945.72, 28,911.82 and 13,412.34 is: 18,513.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,945.72 : 28,911.82 = 13,412.34 : x
  2. Step 2: Convert to fraction form
    20,945.72/28,911.82 = 13,412.34/x
  3. Step 3: Cross multiply
    20,945.72x = 28,911.82 × 13,412.34
  4. Step 4: Simplify right side
    20,945.72x = 387,775,159.86
  5. Step 5: Solve for x
    x = 387,775,159.86/20,945.72
  6. Step 6: Final answer
    x = 18,513.34

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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.