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Finding the Fourth Proportional to 81,190.40, 121,785.60 and 74,969.60

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Solution

The fourth proportional to 81,190.40, 121,785.60 and 74,969.60 is: 112,454.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,190.40 : 121,785.60 = 74,969.60 : x
  2. Step 2: Convert to fraction form
    81,190.40/121,785.60 = 74,969.60/x
  3. Step 3: Cross multiply
    81,190.40x = 121,785.60 × 74,969.60
  4. Step 4: Simplify right side
    81,190.40x = 9,130,217,717.76
  5. Step 5: Solve for x
    x = 9,130,217,717.76/81,190.40
  6. Step 6: Final answer
    x = 112,454.40

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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.