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Finding the Fourth Proportional to 21,164.80, 29,209.60 and 12,780.80

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Solution

The fourth proportional to 21,164.80, 29,209.60 and 12,780.80 is: 17,638.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,164.80 : 29,209.60 = 12,780.80 : x
  2. Step 2: Convert to fraction form
    21,164.80/29,209.60 = 12,780.80/x
  3. Step 3: Cross multiply
    21,164.80x = 29,209.60 × 12,780.80
  4. Step 4: Simplify right side
    21,164.80x = 373,322,055.68
  5. Step 5: Solve for x
    x = 373,322,055.68/21,164.80
  6. Step 6: Final answer
    x = 17,638.82

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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.