Home / 20,905.25-28,848.20-12,407.74

Finding the Fourth Proportional to 20,905.25, 28,848.20 and 12,407.74

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Solution

The fourth proportional to 20,905.25, 28,848.20 and 12,407.74 is: 17,122.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.25 : 28,848.20 = 12,407.74 : x
  2. Step 2: Convert to fraction form
    20,905.25/28,848.20 = 12,407.74/x
  3. Step 3: Cross multiply
    20,905.25x = 28,848.20 × 12,407.74
  4. Step 4: Simplify right side
    20,905.25x = 357,940,965.07
  5. Step 5: Solve for x
    x = 357,940,965.07/20,905.25
  6. Step 6: Final answer
    x = 17,122.06

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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.