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Finding the Fourth Proportional to 81,803.60, 122,705.40 and 81,285.20

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Solution

The fourth proportional to 81,803.60, 122,705.40 and 81,285.20 is: 121,927.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,803.60 : 122,705.40 = 81,285.20 : x
  2. Step 2: Convert to fraction form
    81,803.60/122,705.40 = 81,285.20/x
  3. Step 3: Cross multiply
    81,803.60x = 122,705.40 × 81,285.20
  4. Step 4: Simplify right side
    81,803.60x = 9,974,132,980.08
  5. Step 5: Solve for x
    x = 9,974,132,980.08/81,803.60
  6. Step 6: Final answer
    x = 121,927.80

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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.