Home / 8,115.02-12,172.80-2,921.30

Finding the Fourth Proportional to 8,115.02, 12,172.80 and 2,921.30

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Solution

The fourth proportional to 8,115.02, 12,172.80 and 2,921.30 is: 4,382.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,115.02 : 12,172.80 = 2,921.30 : x
  2. Step 2: Convert to fraction form
    8,115.02/12,172.80 = 2,921.30/x
  3. Step 3: Cross multiply
    8,115.02x = 12,172.80 × 2,921.30
  4. Step 4: Simplify right side
    8,115.02x = 35,560,400.64
  5. Step 5: Solve for x
    x = 35,560,400.64/8,115.02
  6. Step 6: Final answer
    x = 4,382.05

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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.