Home / 20,869.80-28,801.88-12,916.65

Finding the Fourth Proportional to 20,869.80, 28,801.88 and 12,916.65

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Solution

The fourth proportional to 20,869.80, 28,801.88 and 12,916.65 is: 17,825.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,869.80 : 28,801.88 = 12,916.65 : x
  2. Step 2: Convert to fraction form
    20,869.80/28,801.88 = 12,916.65/x
  3. Step 3: Cross multiply
    20,869.80x = 28,801.88 × 12,916.65
  4. Step 4: Simplify right side
    20,869.80x = 372,023,738.72
  5. Step 5: Solve for x
    x = 372,023,738.72/20,869.80
  6. Step 6: Final answer
    x = 17,825.94

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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.