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Finding the Fourth Proportional to 53,979.20, 80,968.80 and 40,857.20

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Solution

The fourth proportional to 53,979.20, 80,968.80 and 40,857.20 is: 61,285.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,979.20 : 80,968.80 = 40,857.20 : x
  2. Step 2: Convert to fraction form
    53,979.20/80,968.80 = 40,857.20/x
  3. Step 3: Cross multiply
    53,979.20x = 80,968.80 × 40,857.20
  4. Step 4: Simplify right side
    53,979.20x = 3,308,158,455.36
  5. Step 5: Solve for x
    x = 3,308,158,455.36/53,979.20
  6. Step 6: Final answer
    x = 61,285.80

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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.