Home / 12,621.62-18,918.08-7,680.38

Finding the Fourth Proportional to 12,621.62, 18,918.08 and 7,680.38

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Solution

The fourth proportional to 12,621.62, 18,918.08 and 7,680.38 is: 11,511.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,621.62 : 18,918.08 = 7,680.38 : x
  2. Step 2: Convert to fraction form
    12,621.62/18,918.08 = 7,680.38/x
  3. Step 3: Cross multiply
    12,621.62x = 18,918.08 × 7,680.38
  4. Step 4: Simplify right side
    12,621.62x = 145,298,043.27
  5. Step 5: Solve for x
    x = 145,298,043.27/12,621.62
  6. Step 6: Final answer
    x = 11,511.84

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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.