Home / 5,120.40-7,680.60-1,422.63

Finding the Fourth Proportional to 5,120.40, 7,680.60 and 1,422.63

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Solution

The fourth proportional to 5,120.40, 7,680.60 and 1,422.63 is: 2,133.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.40 : 7,680.60 = 1,422.63 : x
  2. Step 2: Convert to fraction form
    5,120.40/7,680.60 = 1,422.63/x
  3. Step 3: Cross multiply
    5,120.40x = 7,680.60 × 1,422.63
  4. Step 4: Simplify right side
    5,120.40x = 10,926,665.14
  5. Step 5: Solve for x
    x = 10,926,665.14/5,120.40
  6. Step 6: Final answer
    x = 2,133.95

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Double scale
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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.