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Finding the Fourth Proportional to 21,210.80, 31,804.20 and 8,063.60

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Solution

The fourth proportional to 21,210.80, 31,804.20 and 8,063.60 is: 12,090.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,210.80 : 31,804.20 = 8,063.60 : x
  2. Step 2: Convert to fraction form
    21,210.80/31,804.20 = 8,063.60/x
  3. Step 3: Cross multiply
    21,210.80x = 31,804.20 × 8,063.60
  4. Step 4: Simplify right side
    21,210.80x = 256,456,347.12
  5. Step 5: Solve for x
    x = 256,456,347.12/21,210.80
  6. Step 6: Final answer
    x = 12,090.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.