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Finding the Fourth Proportional to 258,661.40, 388,008.48 and 81,175.42

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Solution

The fourth proportional to 258,661.40, 388,008.48 and 81,175.42 is: 121,768.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,661.40 : 388,008.48 = 81,175.42 : x
  2. Step 2: Convert to fraction form
    258,661.40/388,008.48 = 81,175.42/x
  3. Step 3: Cross multiply
    258,661.40x = 388,008.48 × 81,175.42
  4. Step 4: Simplify right side
    258,661.40x = 31,496,749,477.82
  5. Step 5: Solve for x
    x = 31,496,749,477.82/258,661.40
  6. Step 6: Final answer
    x = 121,768.26

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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.