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Finding the Fourth Proportional to 20,996.40, 28,962.02 and 12,492.78

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Solution

The fourth proportional to 20,996.40, 28,962.02 and 12,492.78 is: 17,232.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,996.40 : 28,962.02 = 12,492.78 : x
  2. Step 2: Convert to fraction form
    20,996.40/28,962.02 = 12,492.78/x
  3. Step 3: Cross multiply
    20,996.40x = 28,962.02 × 12,492.78
  4. Step 4: Simplify right side
    20,996.40x = 361,816,144.22
  5. Step 5: Solve for x
    x = 361,816,144.22/20,996.40
  6. Step 6: Final answer
    x = 17,232.29

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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.