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Finding the Fourth Proportional to 81,134.34, 121,635.90 and 28,580.82

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Solution

The fourth proportional to 81,134.34, 121,635.90 and 28,580.82 is: 42,848.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,134.34 : 121,635.90 = 28,580.82 : x
  2. Step 2: Convert to fraction form
    81,134.34/121,635.90 = 28,580.82/x
  3. Step 3: Cross multiply
    81,134.34x = 121,635.90 × 28,580.82
  4. Step 4: Simplify right side
    81,134.34x = 3,476,453,763.44
  5. Step 5: Solve for x
    x = 3,476,453,763.44/81,134.34
  6. Step 6: Final answer
    x = 42,848.12

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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.