Home / 12,891.28-17,783.64-8,412.96

Finding the Fourth Proportional to 12,891.28, 17,783.64 and 8,412.96

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Solution

The fourth proportional to 12,891.28, 17,783.64 and 8,412.96 is: 11,605.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891.28 : 17,783.64 = 8,412.96 : x
  2. Step 2: Convert to fraction form
    12,891.28/17,783.64 = 8,412.96/x
  3. Step 3: Cross multiply
    12,891.28x = 17,783.64 × 8,412.96
  4. Step 4: Simplify right side
    12,891.28x = 149,613,051.97
  5. Step 5: Solve for x
    x = 149,613,051.97/12,891.28
  6. Step 6: Final answer
    x = 11,605.76

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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.