Home / 3,122.16-4,683.80-1,390.80

Finding the Fourth Proportional to 3,122.16, 4,683.80 and 1,390.80

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Solution

The fourth proportional to 3,122.16, 4,683.80 and 1,390.80 is: 2,086.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,122.16 : 4,683.80 = 1,390.80 : x
  2. Step 2: Convert to fraction form
    3,122.16/4,683.80 = 1,390.80/x
  3. Step 3: Cross multiply
    3,122.16x = 4,683.80 × 1,390.80
  4. Step 4: Simplify right side
    3,122.16x = 6,514,229.04
  5. Step 5: Solve for x
    x = 6,514,229.04/3,122.16
  6. Step 6: Final answer
    x = 2,086.45

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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.