Home / 21,138.87-29,172.78-11,707.50

Finding the Fourth Proportional to 21,138.87, 29,172.78 and 11,707.50

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Solution

The fourth proportional to 21,138.87, 29,172.78 and 11,707.50 is: 16,156.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.87 : 29,172.78 = 11,707.50 : x
  2. Step 2: Convert to fraction form
    21,138.87/29,172.78 = 11,707.50/x
  3. Step 3: Cross multiply
    21,138.87x = 29,172.78 × 11,707.50
  4. Step 4: Simplify right side
    21,138.87x = 341,540,321.85
  5. Step 5: Solve for x
    x = 341,540,321.85/21,138.87
  6. Step 6: Final answer
    x = 16,156.98

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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.