Home / 13,128.96-18,109.68-8,416.32

Finding the Fourth Proportional to 13,128.96, 18,109.68 and 8,416.32

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Solution

The fourth proportional to 13,128.96, 18,109.68 and 8,416.32 is: 11,609.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.96 : 18,109.68 = 8,416.32 : x
  2. Step 2: Convert to fraction form
    13,128.96/18,109.68 = 8,416.32/x
  3. Step 3: Cross multiply
    13,128.96x = 18,109.68 × 8,416.32
  4. Step 4: Simplify right side
    13,128.96x = 152,416,861.98
  5. Step 5: Solve for x
    x = 152,416,861.98/13,128.96
  6. Step 6: Final answer
    x = 11,609.21

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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.