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Finding the Fourth Proportional to 258,453.72, 387,679.50 and 68,913.72

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Solution

The fourth proportional to 258,453.72, 387,679.50 and 68,913.72 is: 103,370.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,453.72 : 387,679.50 = 68,913.72 : x
  2. Step 2: Convert to fraction form
    258,453.72/387,679.50 = 68,913.72/x
  3. Step 3: Cross multiply
    258,453.72x = 387,679.50 × 68,913.72
  4. Step 4: Simplify right side
    258,453.72x = 26,716,436,512.74
  5. Step 5: Solve for x
    x = 26,716,436,512.74/258,453.72
  6. Step 6: Final answer
    x = 103,370.29

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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.