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Finding the Fourth Proportional to 19,980.01, 27,578.87 and 12,900.97

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Solution

The fourth proportional to 19,980.01, 27,578.87 and 12,900.97 is: 17,807.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,980.01 : 27,578.87 = 12,900.97 : x
  2. Step 2: Convert to fraction form
    19,980.01/27,578.87 = 12,900.97/x
  3. Step 3: Cross multiply
    19,980.01x = 27,578.87 × 12,900.97
  4. Step 4: Simplify right side
    19,980.01x = 355,794,174.50
  5. Step 5: Solve for x
    x = 355,794,174.50/19,980.01
  6. Step 6: Final answer
    x = 17,807.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.