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Finding the Fourth Proportional to 81,008.60, 121,460.10 and 72,714.20

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Solution

The fourth proportional to 81,008.60, 121,460.10 and 72,714.20 is: 109,023.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,008.60 : 121,460.10 = 72,714.20 : x
  2. Step 2: Convert to fraction form
    81,008.60/121,460.10 = 72,714.20/x
  3. Step 3: Cross multiply
    81,008.60x = 121,460.10 × 72,714.20
  4. Step 4: Simplify right side
    81,008.60x = 8,831,874,003.42
  5. Step 5: Solve for x
    x = 8,831,874,003.42/81,008.60
  6. Step 6: Final answer
    x = 109,023.91

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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.