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Finding the Fourth Proportional to 53,972.20, 80,919.90 and 20,679.40

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Solution

The fourth proportional to 53,972.20, 80,919.90 and 20,679.40 is: 31,004.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,972.20 : 80,919.90 = 20,679.40 : x
  2. Step 2: Convert to fraction form
    53,972.20/80,919.90 = 20,679.40/x
  3. Step 3: Cross multiply
    53,972.20x = 80,919.90 × 20,679.40
  4. Step 4: Simplify right side
    53,972.20x = 1,673,374,980.06
  5. Step 5: Solve for x
    x = 1,673,374,980.06/53,972.20
  6. Step 6: Final answer
    x = 31,004.39

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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.