Home / 28,748-39,681.96-20,388.80

Finding the Fourth Proportional to 28,748, 39,681.96 and 20,388.80

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Solution

The fourth proportional to 28,748, 39,681.96 and 20,388.80 is: 28,143.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,748 : 39,681.96 = 20,388.80 : x
  2. Step 2: Convert to fraction form
    28,748/39,681.96 = 20,388.80/x
  3. Step 3: Cross multiply
    28,748x = 39,681.96 × 20,388.80
  4. Step 4: Simplify right side
    28,748x = 809,067,546.05
  5. Step 5: Solve for x
    x = 809,067,546.05/28,748
  6. Step 6: Final answer
    x = 28,143.44

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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.