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Finding the Fourth Proportional to 65,419.80, 98,129.70 and 43,258.20

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Solution

The fourth proportional to 65,419.80, 98,129.70 and 43,258.20 is: 64,887.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,419.80 : 98,129.70 = 43,258.20 : x
  2. Step 2: Convert to fraction form
    65,419.80/98,129.70 = 43,258.20/x
  3. Step 3: Cross multiply
    65,419.80x = 98,129.70 × 43,258.20
  4. Step 4: Simplify right side
    65,419.80x = 4,244,914,188.54
  5. Step 5: Solve for x
    x = 4,244,914,188.54/65,419.80
  6. Step 6: Final answer
    x = 64,887.30

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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.