Home / 20,872.79-28,805.63-12,379.94

Finding the Fourth Proportional to 20,872.79, 28,805.63 and 12,379.94

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Solution

The fourth proportional to 20,872.79, 28,805.63 and 12,379.94 is: 17,085.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.79 : 28,805.63 = 12,379.94 : x
  2. Step 2: Convert to fraction form
    20,872.79/28,805.63 = 12,379.94/x
  3. Step 3: Cross multiply
    20,872.79x = 28,805.63 × 12,379.94
  4. Step 4: Simplify right side
    20,872.79x = 356,611,971.06
  5. Step 5: Solve for x
    x = 356,611,971.06/20,872.79
  6. Step 6: Final answer
    x = 17,085.02

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1.5x scale

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.