Home / 12,891.12-17,783.40-8,116.80

Finding the Fourth Proportional to 12,891.12, 17,783.40 and 8,116.80

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Solution

The fourth proportional to 12,891.12, 17,783.40 and 8,116.80 is: 11,197.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891.12 : 17,783.40 = 8,116.80 : x
  2. Step 2: Convert to fraction form
    12,891.12/17,783.40 = 8,116.80/x
  3. Step 3: Cross multiply
    12,891.12x = 17,783.40 × 8,116.80
  4. Step 4: Simplify right side
    12,891.12x = 144,344,301.12
  5. Step 5: Solve for x
    x = 144,344,301.12/12,891.12
  6. Step 6: Final answer
    x = 11,197.19

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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.