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Finding the Fourth Proportional to 81,006.60, 121,457.10 and 72,712.20

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Solution

The fourth proportional to 81,006.60, 121,457.10 and 72,712.20 is: 109,020.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,006.60 : 121,457.10 = 72,712.20 : x
  2. Step 2: Convert to fraction form
    81,006.60/121,457.10 = 72,712.20/x
  3. Step 3: Cross multiply
    81,006.60x = 121,457.10 × 72,712.20
  4. Step 4: Simplify right side
    81,006.60x = 8,831,412,946.62
  5. Step 5: Solve for x
    x = 8,831,412,946.62/81,006.60
  6. Step 6: Final answer
    x = 109,020.91

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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.