Home / 205,861.60-308,806.80-81,186.40

Finding the Fourth Proportional to 205,861.60, 308,806.80 and 81,186.40

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Solution

The fourth proportional to 205,861.60, 308,806.80 and 81,186.40 is: 121,785.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,861.60 : 308,806.80 = 81,186.40 : x
  2. Step 2: Convert to fraction form
    205,861.60/308,806.80 = 81,186.40/x
  3. Step 3: Cross multiply
    205,861.60x = 308,806.80 × 81,186.40
  4. Step 4: Simplify right side
    205,861.60x = 25,070,912,387.52
  5. Step 5: Solve for x
    x = 25,070,912,387.52/205,861.60
  6. Step 6: Final answer
    x = 121,785.28

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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.