Home / 12,120.10-16,725.59-6,815.81

Finding the Fourth Proportional to 12,120.10, 16,725.59 and 6,815.81

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Solution

The fourth proportional to 12,120.10, 16,725.59 and 6,815.81 is: 9,405.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,120.10 : 16,725.59 = 6,815.81 : x
  2. Step 2: Convert to fraction form
    12,120.10/16,725.59 = 6,815.81/x
  3. Step 3: Cross multiply
    12,120.10x = 16,725.59 × 6,815.81
  4. Step 4: Simplify right side
    12,120.10x = 113,998,476.87
  5. Step 5: Solve for x
    x = 113,998,476.87/12,120.10
  6. Step 6: Final answer
    x = 9,405.74

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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.