Home / 20,681.20-28,540.69-11,729.08

Finding the Fourth Proportional to 20,681.20, 28,540.69 and 11,729.08

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Solution

The fourth proportional to 20,681.20, 28,540.69 and 11,729.08 is: 16,186.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,681.20 : 28,540.69 = 11,729.08 : x
  2. Step 2: Convert to fraction form
    20,681.20/28,540.69 = 11,729.08/x
  3. Step 3: Cross multiply
    20,681.20x = 28,540.69 × 11,729.08
  4. Step 4: Simplify right side
    20,681.20x = 334,756,011.83
  5. Step 5: Solve for x
    x = 334,756,011.83/20,681.20
  6. Step 6: Final answer
    x = 16,186.49

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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.