Home / 13,390.16-18,478.72-7,725.12

Finding the Fourth Proportional to 13,390.16, 18,478.72 and 7,725.12

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Solution

The fourth proportional to 13,390.16, 18,478.72 and 7,725.12 is: 10,660.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,390.16 : 18,478.72 = 7,725.12 : x
  2. Step 2: Convert to fraction form
    13,390.16/18,478.72 = 7,725.12/x
  3. Step 3: Cross multiply
    13,390.16x = 18,478.72 × 7,725.12
  4. Step 4: Simplify right side
    13,390.16x = 142,750,408.40
  5. Step 5: Solve for x
    x = 142,750,408.40/13,390.16
  6. Step 6: Final answer
    x = 10,660.84

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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.