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Finding the Fourth Proportional to 53,911.40, 80,867.10 and 21,079.40

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Solution

The fourth proportional to 53,911.40, 80,867.10 and 21,079.40 is: 31,619.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,911.40 : 80,867.10 = 21,079.40 : x
  2. Step 2: Convert to fraction form
    53,911.40/80,867.10 = 21,079.40/x
  3. Step 3: Cross multiply
    53,911.40x = 80,867.10 × 21,079.40
  4. Step 4: Simplify right side
    53,911.40x = 1,704,629,947.74
  5. Step 5: Solve for x
    x = 1,704,629,947.74/53,911.40
  6. Step 6: Final answer
    x = 31,619.10

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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.