Home / 20,851.25-28,774.73-13,399.25

Finding the Fourth Proportional to 20,851.25, 28,774.73 and 13,399.25

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Solution

The fourth proportional to 20,851.25, 28,774.73 and 13,399.25 is: 18,490.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,851.25 : 28,774.73 = 13,399.25 : x
  2. Step 2: Convert to fraction form
    20,851.25/28,774.73 = 13,399.25/x
  3. Step 3: Cross multiply
    20,851.25x = 28,774.73 × 13,399.25
  4. Step 4: Simplify right side
    20,851.25x = 385,559,733.96
  5. Step 5: Solve for x
    x = 385,559,733.96/20,851.25
  6. Step 6: Final answer
    x = 18,490.97

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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.