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Finding the Fourth Proportional to 13,999.80, 21,129.33 and 13,999.80

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Solution

The fourth proportional to 13,999.80, 21,129.33 and 13,999.80 is: 21,129.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,999.80 : 21,129.33 = 13,999.80 : x
  2. Step 2: Convert to fraction form
    13,999.80/21,129.33 = 13,999.80/x
  3. Step 3: Cross multiply
    13,999.80x = 21,129.33 × 13,999.80
  4. Step 4: Simplify right side
    13,999.80x = 295,806,394.13
  5. Step 5: Solve for x
    x = 295,806,394.13/13,999.80
  6. Step 6: Final answer
    x = 21,129.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.