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Finding the Fourth Proportional to 13,125.66, 18,113.48 and 8,412.68

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Solution

The fourth proportional to 13,125.66, 18,113.48 and 8,412.68 is: 11,609.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,125.66 : 18,113.48 = 8,412.68 : x
  2. Step 2: Convert to fraction form
    13,125.66/18,113.48 = 8,412.68/x
  3. Step 3: Cross multiply
    13,125.66x = 18,113.48 × 8,412.68
  4. Step 4: Simplify right side
    13,125.66x = 152,382,778.30
  5. Step 5: Solve for x
    x = 152,382,778.30/13,125.66
  6. Step 6: Final answer
    x = 11,609.53

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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.