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Finding the Fourth Proportional to 351,722.35, 485,385.89 and 215,831.39

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Solution

The fourth proportional to 351,722.35, 485,385.89 and 215,831.39 is: 297,852.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    351,722.35 : 485,385.89 = 215,831.39 : x
  2. Step 2: Convert to fraction form
    351,722.35/485,385.89 = 215,831.39/x
  3. Step 3: Cross multiply
    351,722.35x = 485,385.89 × 215,831.39
  4. Step 4: Simplify right side
    351,722.35x = 104,761,507,819.00
  5. Step 5: Solve for x
    x = 104,761,507,819.00/351,722.35
  6. Step 6: Final answer
    x = 297,852.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.