Home / 12,142.08-18,216-4,747.20

Finding the Fourth Proportional to 12,142.08, 18,216 and 4,747.20

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Solution

The fourth proportional to 12,142.08, 18,216 and 4,747.20 is: 7,121.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,142.08 : 18,216 = 4,747.20 : x
  2. Step 2: Convert to fraction form
    12,142.08/18,216 = 4,747.20/x
  3. Step 3: Cross multiply
    12,142.08x = 18,216 × 4,747.20
  4. Step 4: Simplify right side
    12,142.08x = 86,474,995.20
  5. Step 5: Solve for x
    x = 86,474,995.20/12,142.08
  6. Step 6: Final answer
    x = 7,121.93

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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.