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Finding the Fourth Proportional to 81,207.20, 121,810.80 and 53,213.60

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Solution

The fourth proportional to 81,207.20, 121,810.80 and 53,213.60 is: 79,820.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,207.20 : 121,810.80 = 53,213.60 : x
  2. Step 2: Convert to fraction form
    81,207.20/121,810.80 = 53,213.60/x
  3. Step 3: Cross multiply
    81,207.20x = 121,810.80 × 53,213.60
  4. Step 4: Simplify right side
    81,207.20x = 6,481,991,186.88
  5. Step 5: Solve for x
    x = 6,481,991,186.88/81,207.20
  6. Step 6: Final answer
    x = 79,820.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.