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Finding the Fourth Proportional to 53,991.60, 80,987.40 and 18,934.80

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Solution

The fourth proportional to 53,991.60, 80,987.40 and 18,934.80 is: 28,402.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,991.60 : 80,987.40 = 18,934.80 : x
  2. Step 2: Convert to fraction form
    53,991.60/80,987.40 = 18,934.80/x
  3. Step 3: Cross multiply
    53,991.60x = 80,987.40 × 18,934.80
  4. Step 4: Simplify right side
    53,991.60x = 1,533,480,221.52
  5. Step 5: Solve for x
    x = 1,533,480,221.52/53,991.60
  6. Step 6: Final answer
    x = 28,402.20

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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.