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Finding the Fourth Proportional to 28,649.86, 42,976.86 and 11,993.11

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Solution

The fourth proportional to 28,649.86, 42,976.86 and 11,993.11 is: 17,990.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,649.86 : 42,976.86 = 11,993.11 : x
  2. Step 2: Convert to fraction form
    28,649.86/42,976.86 = 11,993.11/x
  3. Step 3: Cross multiply
    28,649.86x = 42,976.86 × 11,993.11
  4. Step 4: Simplify right side
    28,649.86x = 515,426,209.43
  5. Step 5: Solve for x
    x = 515,426,209.43/28,649.86
  6. Step 6: Final answer
    x = 17,990.53

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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.