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Finding the Fourth Proportional to 390,906.60, 587,612.70 and 363,172.20

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Solution

The fourth proportional to 390,906.60, 587,612.70 and 363,172.20 is: 545,922.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,906.60 : 587,612.70 = 363,172.20 : x
  2. Step 2: Convert to fraction form
    390,906.60/587,612.70 = 363,172.20/x
  3. Step 3: Cross multiply
    390,906.60x = 587,612.70 × 363,172.20
  4. Step 4: Simplify right side
    390,906.60x = 213,404,597,006.94
  5. Step 5: Solve for x
    x = 213,404,597,006.94/390,906.60
  6. Step 6: Final answer
    x = 545,922.22

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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.