Home / 12,072.90-18,115.80-5,145.78

Finding the Fourth Proportional to 12,072.90, 18,115.80 and 5,145.78

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Solution

The fourth proportional to 12,072.90, 18,115.80 and 5,145.78 is: 7,721.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,072.90 : 18,115.80 = 5,145.78 : x
  2. Step 2: Convert to fraction form
    12,072.90/18,115.80 = 5,145.78/x
  3. Step 3: Cross multiply
    12,072.90x = 18,115.80 × 5,145.78
  4. Step 4: Simplify right side
    12,072.90x = 93,219,921.32
  5. Step 5: Solve for x
    x = 93,219,921.32/12,072.90
  6. Step 6: Final answer
    x = 7,721.42

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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.