Home / 13,279.68-18,411.84-12,787.20

Finding the Fourth Proportional to 13,279.68, 18,411.84 and 12,787.20

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Solution

The fourth proportional to 13,279.68, 18,411.84 and 12,787.20 is: 17,729.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,279.68 : 18,411.84 = 12,787.20 : x
  2. Step 2: Convert to fraction form
    13,279.68/18,411.84 = 12,787.20/x
  3. Step 3: Cross multiply
    13,279.68x = 18,411.84 × 12,787.20
  4. Step 4: Simplify right side
    13,279.68x = 235,435,880.45
  5. Step 5: Solve for x
    x = 235,435,880.45/13,279.68
  6. Step 6: Final answer
    x = 17,729.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.