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Finding the Fourth Proportional to 13,489, 20,237.10 and 4,255

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Solution

The fourth proportional to 13,489, 20,237.10 and 4,255 is: 6,383.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,489 : 20,237.10 = 4,255 : x
  2. Step 2: Convert to fraction form
    13,489/20,237.10 = 4,255/x
  3. Step 3: Cross multiply
    13,489x = 20,237.10 × 4,255
  4. Step 4: Simplify right side
    13,489x = 86,108,860.50
  5. Step 5: Solve for x
    x = 86,108,860.50/13,489
  6. Step 6: Final answer
    x = 6,383.64

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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.