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Finding the Fourth Proportional to 81,392.58, 122,276.01 and 57,432.05

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Solution

The fourth proportional to 81,392.58, 122,276.01 and 57,432.05 is: 86,280.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,392.58 : 122,276.01 = 57,432.05 : x
  2. Step 2: Convert to fraction form
    81,392.58/122,276.01 = 57,432.05/x
  3. Step 3: Cross multiply
    81,392.58x = 122,276.01 × 57,432.05
  4. Step 4: Simplify right side
    81,392.58x = 7,022,561,308.74
  5. Step 5: Solve for x
    x = 7,022,561,308.74/81,392.58
  6. Step 6: Final answer
    x = 86,280.12

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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.