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Finding the Fourth Proportional to 53,874.40, 80,811.60 and 21,042.40

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Solution

The fourth proportional to 53,874.40, 80,811.60 and 21,042.40 is: 31,563.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,874.40 : 80,811.60 = 21,042.40 : x
  2. Step 2: Convert to fraction form
    53,874.40/80,811.60 = 21,042.40/x
  3. Step 3: Cross multiply
    53,874.40x = 80,811.60 × 21,042.40
  4. Step 4: Simplify right side
    53,874.40x = 1,700,470,011.84
  5. Step 5: Solve for x
    x = 1,700,470,011.84/53,874.40
  6. Step 6: Final answer
    x = 31,563.60

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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.