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Finding the Fourth Proportional to 85,661.26, 128,258.60 and 66,619.78

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Solution

The fourth proportional to 85,661.26, 128,258.60 and 66,619.78 is: 99,748.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,661.26 : 128,258.60 = 66,619.78 : x
  2. Step 2: Convert to fraction form
    85,661.26/128,258.60 = 66,619.78/x
  3. Step 3: Cross multiply
    85,661.26x = 128,258.60 × 66,619.78
  4. Step 4: Simplify right side
    85,661.26x = 8,544,559,240.36
  5. Step 5: Solve for x
    x = 8,544,559,240.36/85,661.26
  6. Step 6: Final answer
    x = 99,748.24

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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.