Home / 28,026.28-38,679-20,940.40

Finding the Fourth Proportional to 28,026.28, 38,679 and 20,940.40

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Solution

The fourth proportional to 28,026.28, 38,679 and 20,940.40 is: 28,899.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,026.28 : 38,679 = 20,940.40 : x
  2. Step 2: Convert to fraction form
    28,026.28/38,679 = 20,940.40/x
  3. Step 3: Cross multiply
    28,026.28x = 38,679 × 20,940.40
  4. Step 4: Simplify right side
    28,026.28x = 809,953,731.60
  5. Step 5: Solve for x
    x = 809,953,731.60/28,026.28
  6. Step 6: Final answer
    x = 28,899.79

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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.