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Finding the Fourth Proportional to 15,109.29, 20,849.65 and 8,394.79

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Solution

The fourth proportional to 15,109.29, 20,849.65 and 8,394.79 is: 11,584.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,109.29 : 20,849.65 = 8,394.79 : x
  2. Step 2: Convert to fraction form
    15,109.29/20,849.65 = 8,394.79/x
  3. Step 3: Cross multiply
    15,109.29x = 20,849.65 × 8,394.79
  4. Step 4: Simplify right side
    15,109.29x = 175,028,433.32
  5. Step 5: Solve for x
    x = 175,028,433.32/15,109.29
  6. Step 6: Final answer
    x = 11,584.16

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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.