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Finding the Fourth Proportional to 258,135.60, 387,203.40 and 71,146.80

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Solution

The fourth proportional to 258,135.60, 387,203.40 and 71,146.80 is: 106,720.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,135.60 : 387,203.40 = 71,146.80 : x
  2. Step 2: Convert to fraction form
    258,135.60/387,203.40 = 71,146.80/x
  3. Step 3: Cross multiply
    258,135.60x = 387,203.40 × 71,146.80
  4. Step 4: Simplify right side
    258,135.60x = 27,548,282,859.12
  5. Step 5: Solve for x
    x = 27,548,282,859.12/258,135.60
  6. Step 6: Final answer
    x = 106,720.20

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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.