Home / 21,143.35-29,177.67-12,190.78

Finding the Fourth Proportional to 21,143.35, 29,177.67 and 12,190.78

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Solution

The fourth proportional to 21,143.35, 29,177.67 and 12,190.78 is: 16,823.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,143.35 : 29,177.67 = 12,190.78 : x
  2. Step 2: Convert to fraction form
    21,143.35/29,177.67 = 12,190.78/x
  3. Step 3: Cross multiply
    21,143.35x = 29,177.67 × 12,190.78
  4. Step 4: Simplify right side
    21,143.35x = 355,698,555.88
  5. Step 5: Solve for x
    x = 355,698,555.88/21,143.35
  6. Step 6: Final answer
    x = 16,823.19

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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.