Home / 21,561.21-29,754.14-12,129.80

Finding the Fourth Proportional to 21,561.21, 29,754.14 and 12,129.80

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Solution

The fourth proportional to 21,561.21, 29,754.14 and 12,129.80 is: 16,738.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,561.21 : 29,754.14 = 12,129.80 : x
  2. Step 2: Convert to fraction form
    21,561.21/29,754.14 = 12,129.80/x
  3. Step 3: Cross multiply
    21,561.21x = 29,754.14 × 12,129.80
  4. Step 4: Simplify right side
    21,561.21x = 360,911,557.95
  5. Step 5: Solve for x
    x = 360,911,557.95/21,561.21
  6. Step 6: Final answer
    x = 16,738.93

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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.