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Finding the Fourth Proportional to 78,998.40, 108,921.60 and 74,419.20

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Solution

The fourth proportional to 78,998.40, 108,921.60 and 74,419.20 is: 102,607.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,998.40 : 108,921.60 = 74,419.20 : x
  2. Step 2: Convert to fraction form
    78,998.40/108,921.60 = 74,419.20/x
  3. Step 3: Cross multiply
    78,998.40x = 108,921.60 × 74,419.20
  4. Step 4: Simplify right side
    78,998.40x = 8,105,858,334.72
  5. Step 5: Solve for x
    x = 8,105,858,334.72/78,998.40
  6. Step 6: Final answer
    x = 102,607.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.