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Finding the Fourth Proportional to 12,879.60, 19,319.40 and 10,911.30

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Solution

The fourth proportional to 12,879.60, 19,319.40 and 10,911.30 is: 16,366.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,879.60 : 19,319.40 = 10,911.30 : x
  2. Step 2: Convert to fraction form
    12,879.60/19,319.40 = 10,911.30/x
  3. Step 3: Cross multiply
    12,879.60x = 19,319.40 × 10,911.30
  4. Step 4: Simplify right side
    12,879.60x = 210,799,769.22
  5. Step 5: Solve for x
    x = 210,799,769.22/12,879.60
  6. Step 6: Final answer
    x = 16,366.95

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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.