Home / 20,815.56-28,734.84-13,272.01

Finding the Fourth Proportional to 20,815.56, 28,734.84 and 13,272.01

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Solution

The fourth proportional to 20,815.56, 28,734.84 and 13,272.01 is: 18,321.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.56 : 28,734.84 = 13,272.01 : x
  2. Step 2: Convert to fraction form
    20,815.56/28,734.84 = 13,272.01/x
  3. Step 3: Cross multiply
    20,815.56x = 28,734.84 × 13,272.01
  4. Step 4: Simplify right side
    20,815.56x = 381,369,083.83
  5. Step 5: Solve for x
    x = 381,369,083.83/20,815.56
  6. Step 6: Final answer
    x = 18,321.35

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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.