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Finding the Fourth Proportional to 20,872.01, 28,806.33 and 12,916.80

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Solution

The fourth proportional to 20,872.01, 28,806.33 and 12,916.80 is: 17,827.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.01 : 28,806.33 = 12,916.80 : x
  2. Step 2: Convert to fraction form
    20,872.01/28,806.33 = 12,916.80/x
  3. Step 3: Cross multiply
    20,872.01x = 28,806.33 × 12,916.80
  4. Step 4: Simplify right side
    20,872.01x = 372,085,538.76
  5. Step 5: Solve for x
    x = 372,085,538.76/20,872.01
  6. Step 6: Final answer
    x = 17,827.01

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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.