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Finding the Fourth Proportional to 258,539.26, 387,809 and 81,060.10

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Solution

The fourth proportional to 258,539.26, 387,809 and 81,060.10 is: 121,590.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,539.26 : 387,809 = 81,060.10 : x
  2. Step 2: Convert to fraction form
    258,539.26/387,809 = 81,060.10/x
  3. Step 3: Cross multiply
    258,539.26x = 387,809 × 81,060.10
  4. Step 4: Simplify right side
    258,539.26x = 31,435,836,320.90
  5. Step 5: Solve for x
    x = 31,435,836,320.90/258,539.26
  6. Step 6: Final answer
    x = 121,590.18

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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.