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Finding the Fourth Proportional to 258,512.30, 387,804.90 and 81,000.80

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Solution

The fourth proportional to 258,512.30, 387,804.90 and 81,000.80 is: 121,512.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,512.30 : 387,804.90 = 81,000.80 : x
  2. Step 2: Convert to fraction form
    258,512.30/387,804.90 = 81,000.80/x
  3. Step 3: Cross multiply
    258,512.30x = 387,804.90 × 81,000.80
  4. Step 4: Simplify right side
    258,512.30x = 31,412,507,143.92
  5. Step 5: Solve for x
    x = 31,412,507,143.92/258,512.30
  6. Step 6: Final answer
    x = 121,512.62

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1.5x scale

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.