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Finding the Fourth Proportional to 395,686.40, 593,529.60 and 115,212.80

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Solution

The fourth proportional to 395,686.40, 593,529.60 and 115,212.80 is: 172,819.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    395,686.40 : 593,529.60 = 115,212.80 : x
  2. Step 2: Convert to fraction form
    395,686.40/593,529.60 = 115,212.80/x
  3. Step 3: Cross multiply
    395,686.40x = 593,529.60 × 115,212.80
  4. Step 4: Simplify right side
    395,686.40x = 68,382,207,098.88
  5. Step 5: Solve for x
    x = 68,382,207,098.88/395,686.40
  6. Step 6: Final answer
    x = 172,819.20

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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.