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Finding the Fourth Proportional to 117,246.77, 161,856.31 and 78,551.21

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Solution

The fourth proportional to 117,246.77, 161,856.31 and 78,551.21 is: 108,438.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    117,246.77 : 161,856.31 = 78,551.21 : x
  2. Step 2: Convert to fraction form
    117,246.77/161,856.31 = 78,551.21/x
  3. Step 3: Cross multiply
    117,246.77x = 161,856.31 × 78,551.21
  4. Step 4: Simplify right side
    117,246.77x = 12,714,008,996.64
  5. Step 5: Solve for x
    x = 12,714,008,996.64/117,246.77
  6. Step 6: Final answer
    x = 108,438.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.