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Finding the Fourth Proportional to 258,607.56, 387,911.79 and 81,128.55

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Solution

The fourth proportional to 258,607.56, 387,911.79 and 81,128.55 is: 121,692.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,607.56 : 387,911.79 = 81,128.55 : x
  2. Step 2: Convert to fraction form
    258,607.56/387,911.79 = 81,128.55/x
  3. Step 3: Cross multiply
    258,607.56x = 387,911.79 × 81,128.55
  4. Step 4: Simplify right side
    258,607.56x = 31,470,721,050.60
  5. Step 5: Solve for x
    x = 31,470,721,050.60/258,607.56
  6. Step 6: Final answer
    x = 121,692.97

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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.