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Finding the Fourth Proportional to 20,978.78, 28,954.60 and 12,026.35

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Solution

The fourth proportional to 20,978.78, 28,954.60 and 12,026.35 is: 16,598.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.78 : 28,954.60 = 12,026.35 : x
  2. Step 2: Convert to fraction form
    20,978.78/28,954.60 = 12,026.35/x
  3. Step 3: Cross multiply
    20,978.78x = 28,954.60 × 12,026.35
  4. Step 4: Simplify right side
    20,978.78x = 348,218,093.58
  5. Step 5: Solve for x
    x = 348,218,093.58/20,978.78
  6. Step 6: Final answer
    x = 16,598.59

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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.