Home / 13,127.80-18,118.12-8,348.21

Finding the Fourth Proportional to 13,127.80, 18,118.12 and 8,348.21

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Solution

The fourth proportional to 13,127.80, 18,118.12 and 8,348.21 is: 11,521.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,127.80 : 18,118.12 = 8,348.21 : x
  2. Step 2: Convert to fraction form
    13,127.80/18,118.12 = 8,348.21/x
  3. Step 3: Cross multiply
    13,127.80x = 18,118.12 × 8,348.21
  4. Step 4: Simplify right side
    13,127.80x = 151,253,870.57
  5. Step 5: Solve for x
    x = 151,253,870.57/13,127.80
  6. Step 6: Final answer
    x = 11,521.65

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Double scale
Find fourth proportional to 13,128.80, 18,119.50 and 8,349.21
Similar ratio
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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.