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Finding the Fourth Proportional to 81,387.60, 122,081.40 and 53,485.13

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Solution

The fourth proportional to 81,387.60, 122,081.40 and 53,485.13 is: 80,227.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,387.60 : 122,081.40 = 53,485.13 : x
  2. Step 2: Convert to fraction form
    81,387.60/122,081.40 = 53,485.13/x
  3. Step 3: Cross multiply
    81,387.60x = 122,081.40 × 53,485.13
  4. Step 4: Simplify right side
    81,387.60x = 6,529,538,939.18
  5. Step 5: Solve for x
    x = 6,529,538,939.18/81,387.60
  6. Step 6: Final answer
    x = 80,227.69

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1.5x scale

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.