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Finding the Fourth Proportional to 53,986.60, 80,979.90 and 18,929.80

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Solution

The fourth proportional to 53,986.60, 80,979.90 and 18,929.80 is: 28,394.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,986.60 : 80,979.90 = 18,929.80 : x
  2. Step 2: Convert to fraction form
    53,986.60/80,979.90 = 18,929.80/x
  3. Step 3: Cross multiply
    53,986.60x = 80,979.90 × 18,929.80
  4. Step 4: Simplify right side
    53,986.60x = 1,532,933,311.02
  5. Step 5: Solve for x
    x = 1,532,933,311.02/53,986.60
  6. Step 6: Final answer
    x = 28,394.70

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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.