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Finding the Fourth Proportional to 15,078.84, 20,808.30 and 9,109.47

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Solution

The fourth proportional to 15,078.84, 20,808.30 and 9,109.47 is: 12,570.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,078.84 : 20,808.30 = 9,109.47 : x
  2. Step 2: Convert to fraction form
    15,078.84/20,808.30 = 9,109.47/x
  3. Step 3: Cross multiply
    15,078.84x = 20,808.30 × 9,109.47
  4. Step 4: Simplify right side
    15,078.84x = 189,552,584.60
  5. Step 5: Solve for x
    x = 189,552,584.60/15,078.84
  6. Step 6: Final answer
    x = 12,570.77

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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.