Home / 5,120.71-7,679.63-1,422.05

Finding the Fourth Proportional to 5,120.71, 7,679.63 and 1,422.05

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Solution

The fourth proportional to 5,120.71, 7,679.63 and 1,422.05 is: 2,132.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.71 : 7,679.63 = 1,422.05 : x
  2. Step 2: Convert to fraction form
    5,120.71/7,679.63 = 1,422.05/x
  3. Step 3: Cross multiply
    5,120.71x = 7,679.63 × 1,422.05
  4. Step 4: Simplify right side
    5,120.71x = 10,920,829.93
  5. Step 5: Solve for x
    x = 10,920,829.93/5,120.71
  6. Step 6: Final answer
    x = 2,132.68

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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.