Home / 12,135.12-16,742.40-7,891.43

Finding the Fourth Proportional to 12,135.12, 16,742.40 and 7,891.43

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Solution

The fourth proportional to 12,135.12, 16,742.40 and 7,891.43 is: 10,887.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,135.12 : 16,742.40 = 7,891.43 : x
  2. Step 2: Convert to fraction form
    12,135.12/16,742.40 = 7,891.43/x
  3. Step 3: Cross multiply
    12,135.12x = 16,742.40 × 7,891.43
  4. Step 4: Simplify right side
    12,135.12x = 132,121,364.33
  5. Step 5: Solve for x
    x = 132,121,364.33/12,135.12
  6. Step 6: Final answer
    x = 10,887.52

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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.