Home / 18,979.09-28,468.57-5,128.09

Finding the Fourth Proportional to 18,979.09, 28,468.57 and 5,128.09

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Solution

The fourth proportional to 18,979.09, 28,468.57 and 5,128.09 is: 7,692.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979.09 : 28,468.57 = 5,128.09 : x
  2. Step 2: Convert to fraction form
    18,979.09/28,468.57 = 5,128.09/x
  3. Step 3: Cross multiply
    18,979.09x = 28,468.57 × 5,128.09
  4. Step 4: Simplify right side
    18,979.09x = 145,989,389.13
  5. Step 5: Solve for x
    x = 145,989,389.13/18,979.09
  6. Step 6: Final answer
    x = 7,692.12

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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.