Home / 12,128.70-18,189.45-4,728.90

Finding the Fourth Proportional to 12,128.70, 18,189.45 and 4,728.90

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Solution

The fourth proportional to 12,128.70, 18,189.45 and 4,728.90 is: 7,091.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,128.70 : 18,189.45 = 4,728.90 : x
  2. Step 2: Convert to fraction form
    12,128.70/18,189.45 = 4,728.90/x
  3. Step 3: Cross multiply
    12,128.70x = 18,189.45 × 4,728.90
  4. Step 4: Simplify right side
    12,128.70x = 86,016,090.11
  5. Step 5: Solve for x
    x = 86,016,090.11/12,128.70
  6. Step 6: Final answer
    x = 7,091.95

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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.