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Finding the Fourth Proportional to 20,846.90, 28,772.03 and 11,897.30

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Solution

The fourth proportional to 20,846.90, 28,772.03 and 11,897.30 is: 16,420.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,846.90 : 28,772.03 = 11,897.30 : x
  2. Step 2: Convert to fraction form
    20,846.90/28,772.03 = 11,897.30/x
  3. Step 3: Cross multiply
    20,846.90x = 28,772.03 × 11,897.30
  4. Step 4: Simplify right side
    20,846.90x = 342,309,358.40
  5. Step 5: Solve for x
    x = 342,309,358.40/20,846.90
  6. Step 6: Final answer
    x = 16,420.16

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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.