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Finding the Fourth Proportional to 205,986.80, 308,980.20 and 81,311.60

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Solution

The fourth proportional to 205,986.80, 308,980.20 and 81,311.60 is: 121,967.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,986.80 : 308,980.20 = 81,311.60 : x
  2. Step 2: Convert to fraction form
    205,986.80/308,980.20 = 81,311.60/x
  3. Step 3: Cross multiply
    205,986.80x = 308,980.20 × 81,311.60
  4. Step 4: Simplify right side
    205,986.80x = 25,123,674,430.32
  5. Step 5: Solve for x
    x = 25,123,674,430.32/205,986.80
  6. Step 6: Final answer
    x = 121,967.40

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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.