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Finding the Fourth Proportional to 258,868.80, 388,302.93 and 81,391.32

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Solution

The fourth proportional to 258,868.80, 388,302.93 and 81,391.32 is: 122,086.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,868.80 : 388,302.93 = 81,391.32 : x
  2. Step 2: Convert to fraction form
    258,868.80/388,302.93 = 81,391.32/x
  3. Step 3: Cross multiply
    258,868.80x = 388,302.93 × 81,391.32
  4. Step 4: Simplify right side
    258,868.80x = 31,604,488,032.57
  5. Step 5: Solve for x
    x = 31,604,488,032.57/258,868.80
  6. Step 6: Final answer
    x = 122,086.90

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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.