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Finding the Fourth Proportional to 12,145.80, 18,223.28 and 4,755.54

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Solution

The fourth proportional to 12,145.80, 18,223.28 and 4,755.54 is: 7,135.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,145.80 : 18,223.28 = 4,755.54 : x
  2. Step 2: Convert to fraction form
    12,145.80/18,223.28 = 4,755.54/x
  3. Step 3: Cross multiply
    12,145.80x = 18,223.28 × 4,755.54
  4. Step 4: Simplify right side
    12,145.80x = 86,661,536.97
  5. Step 5: Solve for x
    x = 86,661,536.97/12,145.80
  6. Step 6: Final answer
    x = 7,135.10

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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.