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Finding the Fourth Proportional to 109,803.60, 164,705.40 and 72,405.90

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Solution

The fourth proportional to 109,803.60, 164,705.40 and 72,405.90 is: 108,608.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,803.60 : 164,705.40 = 72,405.90 : x
  2. Step 2: Convert to fraction form
    109,803.60/164,705.40 = 72,405.90/x
  3. Step 3: Cross multiply
    109,803.60x = 164,705.40 × 72,405.90
  4. Step 4: Simplify right side
    109,803.60x = 11,925,642,721.86
  5. Step 5: Solve for x
    x = 11,925,642,721.86/109,803.60
  6. Step 6: Final answer
    x = 108,608.85

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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.