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Finding the Fourth Proportional to 258,519.30, 387,815.40 and 81,007.80

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Solution

The fourth proportional to 258,519.30, 387,815.40 and 81,007.80 is: 121,523.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,519.30 : 387,815.40 = 81,007.80 : x
  2. Step 2: Convert to fraction form
    258,519.30/387,815.40 = 81,007.80/x
  3. Step 3: Cross multiply
    258,519.30x = 387,815.40 × 81,007.80
  4. Step 4: Simplify right side
    258,519.30x = 31,416,072,360.12
  5. Step 5: Solve for x
    x = 31,416,072,360.12/258,519.30
  6. Step 6: Final answer
    x = 121,523.12

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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.