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Finding the Fourth Proportional to 258,078.10, 387,059.10 and 108,487.30

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Solution

The fourth proportional to 258,078.10, 387,059.10 and 108,487.30 is: 162,706.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,078.10 : 387,059.10 = 108,487.30 : x
  2. Step 2: Convert to fraction form
    258,078.10/387,059.10 = 108,487.30/x
  3. Step 3: Cross multiply
    258,078.10x = 387,059.10 × 108,487.30
  4. Step 4: Simplify right side
    258,078.10x = 41,990,996,699.43
  5. Step 5: Solve for x
    x = 41,990,996,699.43/258,078.10
  6. Step 6: Final answer
    x = 162,706.55

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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.