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Finding the Fourth Proportional to 15,190.96, 20,944.32 and 12,920.08

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Solution

The fourth proportional to 15,190.96, 20,944.32 and 12,920.08 is: 17,813.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,190.96 : 20,944.32 = 12,920.08 : x
  2. Step 2: Convert to fraction form
    15,190.96/20,944.32 = 12,920.08/x
  3. Step 3: Cross multiply
    15,190.96x = 20,944.32 × 12,920.08
  4. Step 4: Simplify right side
    15,190.96x = 270,602,289.95
  5. Step 5: Solve for x
    x = 270,602,289.95/15,190.96
  6. Step 6: Final answer
    x = 17,813.38

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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.