Home / 13,391.10-18,479.40-7,725.86

Finding the Fourth Proportional to 13,391.10, 18,479.40 and 7,725.86

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Solution

The fourth proportional to 13,391.10, 18,479.40 and 7,725.86 is: 10,661.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,391.10 : 18,479.40 = 7,725.86 : x
  2. Step 2: Convert to fraction form
    13,391.10/18,479.40 = 7,725.86/x
  3. Step 3: Cross multiply
    13,391.10x = 18,479.40 × 7,725.86
  4. Step 4: Simplify right side
    13,391.10x = 142,769,257.28
  5. Step 5: Solve for x
    x = 142,769,257.28/13,391.10
  6. Step 6: Final answer
    x = 10,661.50

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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.