Home / 21,628.80-29,847.96-12,681.60

Finding the Fourth Proportional to 21,628.80, 29,847.96 and 12,681.60

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Solution

The fourth proportional to 21,628.80, 29,847.96 and 12,681.60 is: 17,500.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,628.80 : 29,847.96 = 12,681.60 : x
  2. Step 2: Convert to fraction form
    21,628.80/29,847.96 = 12,681.60/x
  3. Step 3: Cross multiply
    21,628.80x = 29,847.96 × 12,681.60
  4. Step 4: Simplify right side
    21,628.80x = 378,519,889.54
  5. Step 5: Solve for x
    x = 378,519,889.54/21,628.80
  6. Step 6: Final answer
    x = 17,500.73

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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.