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Finding the Fourth Proportional to 6,890.79, 10,335.09 and 1,959.21

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Solution

The fourth proportional to 6,890.79, 10,335.09 and 1,959.21 is: 2,938.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,890.79 : 10,335.09 = 1,959.21 : x
  2. Step 2: Convert to fraction form
    6,890.79/10,335.09 = 1,959.21/x
  3. Step 3: Cross multiply
    6,890.79x = 10,335.09 × 1,959.21
  4. Step 4: Simplify right side
    6,890.79x = 20,248,611.68
  5. Step 5: Solve for x
    x = 20,248,611.68/6,890.79
  6. Step 6: Final answer
    x = 2,938.50

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Double scale
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Similar ratio
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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.