Home / 20,680.40-28,538.36-11,728.76

Finding the Fourth Proportional to 20,680.40, 28,538.36 and 11,728.76

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Solution

The fourth proportional to 20,680.40, 28,538.36 and 11,728.76 is: 16,185.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,680.40 : 28,538.36 = 11,728.76 : x
  2. Step 2: Convert to fraction form
    20,680.40/28,538.36 = 11,728.76/x
  3. Step 3: Cross multiply
    20,680.40x = 28,538.36 × 11,728.76
  4. Step 4: Simplify right side
    20,680.40x = 334,719,575.23
  5. Step 5: Solve for x
    x = 334,719,575.23/20,680.40
  6. Step 6: Final answer
    x = 16,185.35

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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.