Home / 28,900.80-39,887.64-20,940.12

Finding the Fourth Proportional to 28,900.80, 39,887.64 and 20,940.12

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Solution

The fourth proportional to 28,900.80, 39,887.64 and 20,940.12 is: 28,900.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,900.80 : 39,887.64 = 20,940.12 : x
  2. Step 2: Convert to fraction form
    28,900.80/39,887.64 = 20,940.12/x
  3. Step 3: Cross multiply
    28,900.80x = 39,887.64 × 20,940.12
  4. Step 4: Simplify right side
    28,900.80x = 835,251,968.12
  5. Step 5: Solve for x
    x = 835,251,968.12/28,900.80
  6. Step 6: Final answer
    x = 28,900.65

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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.