Home / 12,621.60-18,910.80-7,999.20

Finding the Fourth Proportional to 12,621.60, 18,910.80 and 7,999.20

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Solution

The fourth proportional to 12,621.60, 18,910.80 and 7,999.20 is: 11,985.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,621.60 : 18,910.80 = 7,999.20 : x
  2. Step 2: Convert to fraction form
    12,621.60/18,910.80 = 7,999.20/x
  3. Step 3: Cross multiply
    12,621.60x = 18,910.80 × 7,999.20
  4. Step 4: Simplify right side
    12,621.60x = 151,271,271.36
  5. Step 5: Solve for x
    x = 151,271,271.36/12,621.60
  6. Step 6: Final answer
    x = 11,985.11

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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.