Home / 20,370.78-28,111.40-11,418.26

Finding the Fourth Proportional to 20,370.78, 28,111.40 and 11,418.26

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Solution

The fourth proportional to 20,370.78, 28,111.40 and 11,418.26 is: 15,757.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,370.78 : 28,111.40 = 11,418.26 : x
  2. Step 2: Convert to fraction form
    20,370.78/28,111.40 = 11,418.26/x
  3. Step 3: Cross multiply
    20,370.78x = 28,111.40 × 11,418.26
  4. Step 4: Simplify right side
    20,370.78x = 320,983,274.16
  5. Step 5: Solve for x
    x = 320,983,274.16/20,370.78
  6. Step 6: Final answer
    x = 15,757.04

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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.