Home / 2,451.21-3,381.92-1,388.80

Finding the Fourth Proportional to 2,451.21, 3,381.92 and 1,388.80

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Solution

The fourth proportional to 2,451.21, 3,381.92 and 1,388.80 is: 1,916.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,451.21 : 3,381.92 = 1,388.80 : x
  2. Step 2: Convert to fraction form
    2,451.21/3,381.92 = 1,388.80/x
  3. Step 3: Cross multiply
    2,451.21x = 3,381.92 × 1,388.80
  4. Step 4: Simplify right side
    2,451.21x = 4,696,803.55
  5. Step 5: Solve for x
    x = 4,696,803.55/2,451.21
  6. Step 6: Final answer
    x = 1,916.12

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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.