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Finding the Fourth Proportional to 258,739.28, 388,125.30 and 81,253.28

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Solution

The fourth proportional to 258,739.28, 388,125.30 and 81,253.28 is: 121,885.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,739.28 : 388,125.30 = 81,253.28 : x
  2. Step 2: Convert to fraction form
    258,739.28/388,125.30 = 81,253.28/x
  3. Step 3: Cross multiply
    258,739.28x = 388,125.30 × 81,253.28
  4. Step 4: Simplify right side
    258,739.28x = 31,536,453,675.98
  5. Step 5: Solve for x
    x = 31,536,453,675.98/258,739.28
  6. Step 6: Final answer
    x = 121,885.06

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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.