Home / 20,940.48-28,899.23-12,987.99

Finding the Fourth Proportional to 20,940.48, 28,899.23 and 12,987.99

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Solution

The fourth proportional to 20,940.48, 28,899.23 and 12,987.99 is: 17,924.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,940.48 : 28,899.23 = 12,987.99 : x
  2. Step 2: Convert to fraction form
    20,940.48/28,899.23 = 12,987.99/x
  3. Step 3: Cross multiply
    20,940.48x = 28,899.23 × 12,987.99
  4. Step 4: Simplify right side
    20,940.48x = 375,342,845.31
  5. Step 5: Solve for x
    x = 375,342,845.31/20,940.48
  6. Step 6: Final answer
    x = 17,924.27

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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.