Home / 20,106.80-30,148.20-12,321.20

Finding the Fourth Proportional to 20,106.80, 30,148.20 and 12,321.20

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Solution

The fourth proportional to 20,106.80, 30,148.20 and 12,321.20 is: 18,474.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,106.80 : 30,148.20 = 12,321.20 : x
  2. Step 2: Convert to fraction form
    20,106.80/30,148.20 = 12,321.20/x
  3. Step 3: Cross multiply
    20,106.80x = 30,148.20 × 12,321.20
  4. Step 4: Simplify right side
    20,106.80x = 371,462,001.84
  5. Step 5: Solve for x
    x = 371,462,001.84/20,106.80
  6. Step 6: Final answer
    x = 18,474.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.