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Finding the Fourth Proportional to 13,999.30, 21,128.58 and 13,999.30

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Solution

The fourth proportional to 13,999.30, 21,128.58 and 13,999.30 is: 21,128.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,999.30 : 21,128.58 = 13,999.30 : x
  2. Step 2: Convert to fraction form
    13,999.30/21,128.58 = 13,999.30/x
  3. Step 3: Cross multiply
    13,999.30x = 21,128.58 × 13,999.30
  4. Step 4: Simplify right side
    13,999.30x = 295,785,260.00
  5. Step 5: Solve for x
    x = 295,785,260.00/13,999.30
  6. Step 6: Final answer
    x = 21,128.58

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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.