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Finding the Fourth Proportional to 21,804.92, 30,090.50 and 12,852.80

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Solution

The fourth proportional to 21,804.92, 30,090.50 and 12,852.80 is: 17,736.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,804.92 : 30,090.50 = 12,852.80 : x
  2. Step 2: Convert to fraction form
    21,804.92/30,090.50 = 12,852.80/x
  3. Step 3: Cross multiply
    21,804.92x = 30,090.50 × 12,852.80
  4. Step 4: Simplify right side
    21,804.92x = 386,747,178.40
  5. Step 5: Solve for x
    x = 386,747,178.40/21,804.92
  6. Step 6: Final answer
    x = 17,736.69

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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.