Home / 20,809.31-28,720.04-13,258.94

Finding the Fourth Proportional to 20,809.31, 28,720.04 and 13,258.94

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Solution

The fourth proportional to 20,809.31, 28,720.04 and 13,258.94 is: 18,299.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,809.31 : 28,720.04 = 13,258.94 : x
  2. Step 2: Convert to fraction form
    20,809.31/28,720.04 = 13,258.94/x
  3. Step 3: Cross multiply
    20,809.31x = 28,720.04 × 13,258.94
  4. Step 4: Simplify right side
    20,809.31x = 380,797,077.26
  5. Step 5: Solve for x
    x = 380,797,077.26/20,809.31
  6. Step 6: Final answer
    x = 18,299.37

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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.