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Finding the Fourth Proportional to 258,031.88, 386,849.10 and 80,433.80

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Solution

The fourth proportional to 258,031.88, 386,849.10 and 80,433.80 is: 120,588.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,031.88 : 386,849.10 = 80,433.80 : x
  2. Step 2: Convert to fraction form
    258,031.88/386,849.10 = 80,433.80/x
  3. Step 3: Cross multiply
    258,031.88x = 386,849.10 × 80,433.80
  4. Step 4: Simplify right side
    258,031.88x = 31,115,743,139.58
  5. Step 5: Solve for x
    x = 31,115,743,139.58/258,031.88
  6. Step 6: Final answer
    x = 120,588.75

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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.