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Finding the Fourth Proportional to 81,007.60, 121,458.60 and 72,713.20

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Solution

The fourth proportional to 81,007.60, 121,458.60 and 72,713.20 is: 109,022.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,007.60 : 121,458.60 = 72,713.20 : x
  2. Step 2: Convert to fraction form
    81,007.60/121,458.60 = 72,713.20/x
  3. Step 3: Cross multiply
    81,007.60x = 121,458.60 × 72,713.20
  4. Step 4: Simplify right side
    81,007.60x = 8,831,643,473.52
  5. Step 5: Solve for x
    x = 8,831,643,473.52/81,007.60
  6. Step 6: Final answer
    x = 109,022.41

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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.