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Finding the Fourth Proportional to 12,879.90, 19,276.65 and 8,991.90

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Solution

The fourth proportional to 12,879.90, 19,276.65 and 8,991.90 is: 13,457.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,879.90 : 19,276.65 = 8,991.90 : x
  2. Step 2: Convert to fraction form
    12,879.90/19,276.65 = 8,991.90/x
  3. Step 3: Cross multiply
    12,879.90x = 19,276.65 × 8,991.90
  4. Step 4: Simplify right side
    12,879.90x = 173,333,709.14
  5. Step 5: Solve for x
    x = 173,333,709.14/12,879.90
  6. Step 6: Final answer
    x = 13,457.69

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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.