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Finding the Fourth Proportional to 258,867.80, 388,301.40 and 81,390.32

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Solution

The fourth proportional to 258,867.80, 388,301.40 and 81,390.32 is: 122,085.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,867.80 : 388,301.40 = 81,390.32 : x
  2. Step 2: Convert to fraction form
    258,867.80/388,301.40 = 81,390.32/x
  3. Step 3: Cross multiply
    258,867.80x = 388,301.40 × 81,390.32
  4. Step 4: Simplify right side
    258,867.80x = 31,603,975,202.45
  5. Step 5: Solve for x
    x = 31,603,975,202.45/258,867.80
  6. Step 6: Final answer
    x = 122,085.39

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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.