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Finding the Fourth Proportional to 53,979.70, 80,969.55 and 40,857.70

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Solution

The fourth proportional to 53,979.70, 80,969.55 and 40,857.70 is: 61,286.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,979.70 : 80,969.55 = 40,857.70 : x
  2. Step 2: Convert to fraction form
    53,979.70/80,969.55 = 40,857.70/x
  3. Step 3: Cross multiply
    53,979.70x = 80,969.55 × 40,857.70
  4. Step 4: Simplify right side
    53,979.70x = 3,308,229,583.04
  5. Step 5: Solve for x
    x = 3,308,229,583.04/53,979.70
  6. Step 6: Final answer
    x = 61,286.55

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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.