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Finding the Fourth Proportional to 81,102.90, 121,617.90 and 31,166.40

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Solution

The fourth proportional to 81,102.90, 121,617.90 and 31,166.40 is: 46,735.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,102.90 : 121,617.90 = 31,166.40 : x
  2. Step 2: Convert to fraction form
    81,102.90/121,617.90 = 31,166.40/x
  3. Step 3: Cross multiply
    81,102.90x = 121,617.90 × 31,166.40
  4. Step 4: Simplify right side
    81,102.90x = 3,790,392,118.56
  5. Step 5: Solve for x
    x = 3,790,392,118.56/81,102.90
  6. Step 6: Final answer
    x = 46,735.59

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1.5x scale

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.