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Finding the Fourth Proportional to 18,345.18, 27,512.39 and 7,815.09

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Solution

The fourth proportional to 18,345.18, 27,512.39 and 7,815.09 is: 11,720.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,345.18 : 27,512.39 = 7,815.09 : x
  2. Step 2: Convert to fraction form
    18,345.18/27,512.39 = 7,815.09/x
  3. Step 3: Cross multiply
    18,345.18x = 27,512.39 × 7,815.09
  4. Step 4: Simplify right side
    18,345.18x = 215,011,764.89
  5. Step 5: Solve for x
    x = 215,011,764.89/18,345.18
  6. Step 6: Final answer
    x = 11,720.34

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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.