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Finding the Fourth Proportional to 13,645.63, 18,828.14 and 7,979.28

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Solution

The fourth proportional to 13,645.63, 18,828.14 and 7,979.28 is: 11,009.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,645.63 : 18,828.14 = 7,979.28 : x
  2. Step 2: Convert to fraction form
    13,645.63/18,828.14 = 7,979.28/x
  3. Step 3: Cross multiply
    13,645.63x = 18,828.14 × 7,979.28
  4. Step 4: Simplify right side
    13,645.63x = 150,235,000.94
  5. Step 5: Solve for x
    x = 150,235,000.94/13,645.63
  6. Step 6: Final answer
    x = 11,009.75

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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.