Home / 20,971.75-28,941.11-12,019.78

Finding the Fourth Proportional to 20,971.75, 28,941.11 and 12,019.78

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Solution

The fourth proportional to 20,971.75, 28,941.11 and 12,019.78 is: 16,587.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.75 : 28,941.11 = 12,019.78 : x
  2. Step 2: Convert to fraction form
    20,971.75/28,941.11 = 12,019.78/x
  3. Step 3: Cross multiply
    20,971.75x = 28,941.11 × 12,019.78
  4. Step 4: Simplify right side
    20,971.75x = 347,865,775.16
  5. Step 5: Solve for x
    x = 347,865,775.16/20,971.75
  6. Step 6: Final answer
    x = 16,587.35

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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.