Home / 20,848.78-28,770.42-12,891.88

Finding the Fourth Proportional to 20,848.78, 28,770.42 and 12,891.88

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Solution

The fourth proportional to 20,848.78, 28,770.42 and 12,891.88 is: 17,790.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,848.78 : 28,770.42 = 12,891.88 : x
  2. Step 2: Convert to fraction form
    20,848.78/28,770.42 = 12,891.88/x
  3. Step 3: Cross multiply
    20,848.78x = 28,770.42 × 12,891.88
  4. Step 4: Simplify right side
    20,848.78x = 370,904,802.19
  5. Step 5: Solve for x
    x = 370,904,802.19/20,848.78
  6. Step 6: Final answer
    x = 17,790.24

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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.