Home / 21,878.75-30,190.86-12,319.51

Finding the Fourth Proportional to 21,878.75, 30,190.86 and 12,319.51

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Solution

The fourth proportional to 21,878.75, 30,190.86 and 12,319.51 is: 16,999.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,878.75 : 30,190.86 = 12,319.51 : x
  2. Step 2: Convert to fraction form
    21,878.75/30,190.86 = 12,319.51/x
  3. Step 3: Cross multiply
    21,878.75x = 30,190.86 × 12,319.51
  4. Step 4: Simplify right side
    21,878.75x = 371,936,601.68
  5. Step 5: Solve for x
    x = 371,936,601.68/21,878.75
  6. Step 6: Final answer
    x = 16,999.90

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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.