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Finding the Fourth Proportional to 81,102.79, 111,905.62 and 45,287.29

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Solution

The fourth proportional to 81,102.79, 111,905.62 and 45,287.29 is: 62,487.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,102.79 : 111,905.62 = 45,287.29 : x
  2. Step 2: Convert to fraction form
    81,102.79/111,905.62 = 45,287.29/x
  3. Step 3: Cross multiply
    81,102.79x = 111,905.62 × 45,287.29
  4. Step 4: Simplify right side
    81,102.79x = 5,067,902,601.94
  5. Step 5: Solve for x
    x = 5,067,902,601.94/81,102.79
  6. Step 6: Final answer
    x = 62,487.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.