Home / 20,916.84-28,866.79-12,960.62

Finding the Fourth Proportional to 20,916.84, 28,866.79 and 12,960.62

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Solution

The fourth proportional to 20,916.84, 28,866.79 and 12,960.62 is: 17,886.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,916.84 : 28,866.79 = 12,960.62 : x
  2. Step 2: Convert to fraction form
    20,916.84/28,866.79 = 12,960.62/x
  3. Step 3: Cross multiply
    20,916.84x = 28,866.79 × 12,960.62
  4. Step 4: Simplify right side
    20,916.84x = 374,131,475.93
  5. Step 5: Solve for x
    x = 374,131,475.93/20,916.84
  6. Step 6: Final answer
    x = 17,886.61

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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.