Home / 21,828-30,121.60-12,875.84

Finding the Fourth Proportional to 21,828, 30,121.60 and 12,875.84

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Solution

The fourth proportional to 21,828, 30,121.60 and 12,875.84 is: 17,768.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,828 : 30,121.60 = 12,875.84 : x
  2. Step 2: Convert to fraction form
    21,828/30,121.60 = 12,875.84/x
  3. Step 3: Cross multiply
    21,828x = 30,121.60 × 12,875.84
  4. Step 4: Simplify right side
    21,828x = 387,840,902.14
  5. Step 5: Solve for x
    x = 387,840,902.14/21,828
  6. Step 6: Final answer
    x = 17,768.05

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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.