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Finding the Fourth Proportional to 258,728.90, 388,066.04 and 69,208.39

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Solution

The fourth proportional to 258,728.90, 388,066.04 and 69,208.39 is: 103,805.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,728.90 : 388,066.04 = 69,208.39 : x
  2. Step 2: Convert to fraction form
    258,728.90/388,066.04 = 69,208.39/x
  3. Step 3: Cross multiply
    258,728.90x = 388,066.04 × 69,208.39
  4. Step 4: Simplify right side
    258,728.90x = 26,857,423,901.75
  5. Step 5: Solve for x
    x = 26,857,423,901.75/258,728.90
  6. Step 6: Final answer
    x = 103,805.27

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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.