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Finding the Fourth Proportional to 258,987.83, 388,481.21 and 81,510.35

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Solution

The fourth proportional to 258,987.83, 388,481.21 and 81,510.35 is: 122,265.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,987.83 : 388,481.21 = 81,510.35 : x
  2. Step 2: Convert to fraction form
    258,987.83/388,481.21 = 81,510.35/x
  3. Step 3: Cross multiply
    258,987.83x = 388,481.21 × 81,510.35
  4. Step 4: Simplify right side
    258,987.83x = 31,665,238,987.97
  5. Step 5: Solve for x
    x = 31,665,238,987.97/258,987.83
  6. Step 6: Final answer
    x = 122,265.36

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1.5x scale

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.