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Finding the Fourth Proportional to 15,078.51, 20,808.39 and 9,109.08

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Solution

The fourth proportional to 15,078.51, 20,808.39 and 9,109.08 is: 12,570.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,078.51 : 20,808.39 = 9,109.08 : x
  2. Step 2: Convert to fraction form
    15,078.51/20,808.39 = 9,109.08/x
  3. Step 3: Cross multiply
    15,078.51x = 20,808.39 × 9,109.08
  4. Step 4: Simplify right side
    15,078.51x = 189,545,289.18
  5. Step 5: Solve for x
    x = 189,545,289.18/15,078.51
  6. Step 6: Final answer
    x = 12,570.56

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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.