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Finding the Fourth Proportional to 81,166.40, 121,749.60 and 72,257.60

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Solution

The fourth proportional to 81,166.40, 121,749.60 and 72,257.60 is: 108,386.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,166.40 : 121,749.60 = 72,257.60 : x
  2. Step 2: Convert to fraction form
    81,166.40/121,749.60 = 72,257.60/x
  3. Step 3: Cross multiply
    81,166.40x = 121,749.60 × 72,257.60
  4. Step 4: Simplify right side
    81,166.40x = 8,797,333,896.96
  5. Step 5: Solve for x
    x = 8,797,333,896.96/81,166.40
  6. Step 6: Final answer
    x = 108,386.40

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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.