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Finding the Fourth Proportional to 258,129.68, 387,194.51 and 80,636.87

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Solution

The fourth proportional to 258,129.68, 387,194.51 and 80,636.87 is: 120,955.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,129.68 : 387,194.51 = 80,636.87 : x
  2. Step 2: Convert to fraction form
    258,129.68/387,194.51 = 80,636.87/x
  3. Step 3: Cross multiply
    258,129.68x = 387,194.51 × 80,636.87
  4. Step 4: Simplify right side
    258,129.68x = 31,222,154,537.16
  5. Step 5: Solve for x
    x = 31,222,154,537.16/258,129.68
  6. Step 6: Final answer
    x = 120,955.31

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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.