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Finding the Fourth Proportional to 61,292.80, 91,917.60 and 21,851.20

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Solution

The fourth proportional to 61,292.80, 91,917.60 and 21,851.20 is: 32,769.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,292.80 : 91,917.60 = 21,851.20 : x
  2. Step 2: Convert to fraction form
    61,292.80/91,917.60 = 21,851.20/x
  3. Step 3: Cross multiply
    61,292.80x = 91,917.60 × 21,851.20
  4. Step 4: Simplify right side
    61,292.80x = 2,008,509,861.12
  5. Step 5: Solve for x
    x = 2,008,509,861.12/61,292.80
  6. Step 6: Final answer
    x = 32,769.10

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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.