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Finding the Fourth Proportional to 21,172.02, 31,739.40 and 8,014.80

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Solution

The fourth proportional to 21,172.02, 31,739.40 and 8,014.80 is: 12,015.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,172.02 : 31,739.40 = 8,014.80 : x
  2. Step 2: Convert to fraction form
    21,172.02/31,739.40 = 8,014.80/x
  3. Step 3: Cross multiply
    21,172.02x = 31,739.40 × 8,014.80
  4. Step 4: Simplify right side
    21,172.02x = 254,384,943.12
  5. Step 5: Solve for x
    x = 254,384,943.12/21,172.02
  6. Step 6: Final answer
    x = 12,015.15

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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.