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Finding the Fourth Proportional to 258,430.59, 387,645.66 and 80,951.44

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Solution

The fourth proportional to 258,430.59, 387,645.66 and 80,951.44 is: 121,427.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,430.59 : 387,645.66 = 80,951.44 : x
  2. Step 2: Convert to fraction form
    258,430.59/387,645.66 = 80,951.44/x
  3. Step 3: Cross multiply
    258,430.59x = 387,645.66 × 80,951.44
  4. Step 4: Simplify right side
    258,430.59x = 31,380,473,981.99
  5. Step 5: Solve for x
    x = 31,380,473,981.99/258,430.59
  6. Step 6: Final answer
    x = 121,427.09

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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.