Home / 3,421.28-5,131.84-1,112.80

Finding the Fourth Proportional to 3,421.28, 5,131.84 and 1,112.80

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Solution

The fourth proportional to 3,421.28, 5,131.84 and 1,112.80 is: 1,669.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,421.28 : 5,131.84 = 1,112.80 : x
  2. Step 2: Convert to fraction form
    3,421.28/5,131.84 = 1,112.80/x
  3. Step 3: Cross multiply
    3,421.28x = 5,131.84 × 1,112.80
  4. Step 4: Simplify right side
    3,421.28x = 5,710,711.55
  5. Step 5: Solve for x
    x = 5,710,711.55/3,421.28
  6. Step 6: Final answer
    x = 1,669.17

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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.