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Finding the Fourth Proportional to 258,728.40, 388,065.29 and 69,207.89

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Solution

The fourth proportional to 258,728.40, 388,065.29 and 69,207.89 is: 103,804.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,728.40 : 388,065.29 = 69,207.89 : x
  2. Step 2: Convert to fraction form
    258,728.40/388,065.29 = 69,207.89/x
  3. Step 3: Cross multiply
    258,728.40x = 388,065.29 × 69,207.89
  4. Step 4: Simplify right side
    258,728.40x = 26,857,177,962.81
  5. Step 5: Solve for x
    x = 26,857,177,962.81/258,728.40
  6. Step 6: Final answer
    x = 103,804.52

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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.