Home / 3,928.09-5,415.15-2,808.63

Finding the Fourth Proportional to 3,928.09, 5,415.15 and 2,808.63

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Solution

The fourth proportional to 3,928.09, 5,415.15 and 2,808.63 is: 3,871.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.09 : 5,415.15 = 2,808.63 : x
  2. Step 2: Convert to fraction form
    3,928.09/5,415.15 = 2,808.63/x
  3. Step 3: Cross multiply
    3,928.09x = 5,415.15 × 2,808.63
  4. Step 4: Simplify right side
    3,928.09x = 15,209,152.74
  5. Step 5: Solve for x
    x = 15,209,152.74/3,928.09
  6. Step 6: Final answer
    x = 3,871.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.