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Finding the Fourth Proportional to 20,999.70, 28,982.37 and 12,048.12

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Solution

The fourth proportional to 20,999.70, 28,982.37 and 12,048.12 is: 16,628.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.70 : 28,982.37 = 12,048.12 : x
  2. Step 2: Convert to fraction form
    20,999.70/28,982.37 = 12,048.12/x
  3. Step 3: Cross multiply
    20,999.70x = 28,982.37 × 12,048.12
  4. Step 4: Simplify right side
    20,999.70x = 349,183,071.64
  5. Step 5: Solve for x
    x = 349,183,071.64/20,999.70
  6. Step 6: Final answer
    x = 16,628.00

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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.