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Finding the Fourth Proportional to 20,641.68, 30,964.76 and 6,790.64

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Solution

The fourth proportional to 20,641.68, 30,964.76 and 6,790.64 is: 10,186.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,641.68 : 30,964.76 = 6,790.64 : x
  2. Step 2: Convert to fraction form
    20,641.68/30,964.76 = 6,790.64/x
  3. Step 3: Cross multiply
    20,641.68x = 30,964.76 × 6,790.64
  4. Step 4: Simplify right side
    20,641.68x = 210,270,537.85
  5. Step 5: Solve for x
    x = 210,270,537.85/20,641.68
  6. Step 6: Final answer
    x = 10,186.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.