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Finding the Fourth Proportional to 20,866.99, 28,801.77 and 12,904.56

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Solution

The fourth proportional to 20,866.99, 28,801.77 and 12,904.56 is: 17,811.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,866.99 : 28,801.77 = 12,904.56 : x
  2. Step 2: Convert to fraction form
    20,866.99/28,801.77 = 12,904.56/x
  3. Step 3: Cross multiply
    20,866.99x = 28,801.77 × 12,904.56
  4. Step 4: Simplify right side
    20,866.99x = 371,674,169.07
  5. Step 5: Solve for x
    x = 371,674,169.07/20,866.99
  6. Step 6: Final answer
    x = 17,811.59

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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.