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Finding the Fourth Proportional to 258,609.56, 387,914.80 and 81,130.56

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Solution

The fourth proportional to 258,609.56, 387,914.80 and 81,130.56 is: 121,695.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,609.56 : 387,914.80 = 81,130.56 : x
  2. Step 2: Convert to fraction form
    258,609.56/387,914.80 = 81,130.56/x
  3. Step 3: Cross multiply
    258,609.56x = 387,914.80 × 81,130.56
  4. Step 4: Simplify right side
    258,609.56x = 31,471,744,956.29
  5. Step 5: Solve for x
    x = 31,471,744,956.29/258,609.56
  6. Step 6: Final answer
    x = 121,695.98

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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.