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Finding the Fourth Proportional to 53,980.60, 80,913.30 and 20,687.80

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Solution

The fourth proportional to 53,980.60, 80,913.30 and 20,687.80 is: 31,009.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,980.60 : 80,913.30 = 20,687.80 : x
  2. Step 2: Convert to fraction form
    53,980.60/80,913.30 = 20,687.80/x
  3. Step 3: Cross multiply
    53,980.60x = 80,913.30 × 20,687.80
  4. Step 4: Simplify right side
    53,980.60x = 1,673,918,167.74
  5. Step 5: Solve for x
    x = 1,673,918,167.74/53,980.60
  6. Step 6: Final answer
    x = 31,009.63

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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.