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Finding the Fourth Proportional to 258,488.55, 387,732.96 and 81,009.38

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Solution

The fourth proportional to 258,488.55, 387,732.96 and 81,009.38 is: 121,514.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,488.55 : 387,732.96 = 81,009.38 : x
  2. Step 2: Convert to fraction form
    258,488.55/387,732.96 = 81,009.38/x
  3. Step 3: Cross multiply
    258,488.55x = 387,732.96 × 81,009.38
  4. Step 4: Simplify right side
    258,488.55x = 31,410,007,664.50
  5. Step 5: Solve for x
    x = 31,410,007,664.50/258,488.55
  6. Step 6: Final answer
    x = 121,514.12

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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.