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Finding the Fourth Proportional to 53,987.60, 80,981.40 and 18,930.80

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Solution

The fourth proportional to 53,987.60, 80,981.40 and 18,930.80 is: 28,396.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,987.60 : 80,981.40 = 18,930.80 : x
  2. Step 2: Convert to fraction form
    53,987.60/80,981.40 = 18,930.80/x
  3. Step 3: Cross multiply
    53,987.60x = 80,981.40 × 18,930.80
  4. Step 4: Simplify right side
    53,987.60x = 1,533,042,687.12
  5. Step 5: Solve for x
    x = 1,533,042,687.12/53,987.60
  6. Step 6: Final answer
    x = 28,396.20

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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.