Home / 3,939.90-5,885.88-2,820.45

Finding the Fourth Proportional to 3,939.90, 5,885.88 and 2,820.45

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Solution

The fourth proportional to 3,939.90, 5,885.88 and 2,820.45 is: 4,213.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.90 : 5,885.88 = 2,820.45 : x
  2. Step 2: Convert to fraction form
    3,939.90/5,885.88 = 2,820.45/x
  3. Step 3: Cross multiply
    3,939.90x = 5,885.88 × 2,820.45
  4. Step 4: Simplify right side
    3,939.90x = 16,600,830.25
  5. Step 5: Solve for x
    x = 16,600,830.25/3,939.90
  6. Step 6: Final answer
    x = 4,213.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.