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Finding the Fourth Proportional to 12,992.80, 19,489.20 and 11,917.60

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Solution

The fourth proportional to 12,992.80, 19,489.20 and 11,917.60 is: 17,876.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,992.80 : 19,489.20 = 11,917.60 : x
  2. Step 2: Convert to fraction form
    12,992.80/19,489.20 = 11,917.60/x
  3. Step 3: Cross multiply
    12,992.80x = 19,489.20 × 11,917.60
  4. Step 4: Simplify right side
    12,992.80x = 232,264,489.92
  5. Step 5: Solve for x
    x = 232,264,489.92/12,992.80
  6. Step 6: Final answer
    x = 17,876.40

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1.5x scale

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.