Home / 13,390.45-18,478.63-7,725.21

Finding the Fourth Proportional to 13,390.45, 18,478.63 and 7,725.21

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Solution

The fourth proportional to 13,390.45, 18,478.63 and 7,725.21 is: 10,660.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,390.45 : 18,478.63 = 7,725.21 : x
  2. Step 2: Convert to fraction form
    13,390.45/18,478.63 = 7,725.21/x
  3. Step 3: Cross multiply
    13,390.45x = 18,478.63 × 7,725.21
  4. Step 4: Simplify right side
    13,390.45x = 142,751,237.62
  5. Step 5: Solve for x
    x = 142,751,237.62/13,390.45
  6. Step 6: Final answer
    x = 10,660.68

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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.