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Finding the Fourth Proportional to 81,009.60, 121,461.60 and 72,715.20

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Solution

The fourth proportional to 81,009.60, 121,461.60 and 72,715.20 is: 109,025.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,009.60 : 121,461.60 = 72,715.20 : x
  2. Step 2: Convert to fraction form
    81,009.60/121,461.60 = 72,715.20/x
  3. Step 3: Cross multiply
    81,009.60x = 121,461.60 × 72,715.20
  4. Step 4: Simplify right side
    81,009.60x = 8,832,104,536.32
  5. Step 5: Solve for x
    x = 8,832,104,536.32/81,009.60
  6. Step 6: Final answer
    x = 109,025.41

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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.