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Finding the Fourth Proportional to 20,929.99, 28,866.65 and 13,767.25

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Solution

The fourth proportional to 20,929.99, 28,866.65 and 13,767.25 is: 18,987.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,929.99 : 28,866.65 = 13,767.25 : x
  2. Step 2: Convert to fraction form
    20,929.99/28,866.65 = 13,767.25/x
  3. Step 3: Cross multiply
    20,929.99x = 28,866.65 × 13,767.25
  4. Step 4: Simplify right side
    20,929.99x = 397,414,174.04
  5. Step 5: Solve for x
    x = 397,414,174.04/20,929.99
  6. Step 6: Final answer
    x = 18,987.79

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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.