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Finding the Fourth Proportional to 258,739.65, 388,125.91 and 81,253.67

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Solution

The fourth proportional to 258,739.65, 388,125.91 and 81,253.67 is: 121,885.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,739.65 : 388,125.91 = 81,253.67 : x
  2. Step 2: Convert to fraction form
    258,739.65/388,125.91 = 81,253.67/x
  3. Step 3: Cross multiply
    258,739.65x = 388,125.91 × 81,253.67
  4. Step 4: Simplify right side
    258,739.65x = 31,536,652,770.53
  5. Step 5: Solve for x
    x = 31,536,652,770.53/258,739.65
  6. Step 6: Final answer
    x = 121,885.66

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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.