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Finding the Fourth Proportional to 287,604.90, 431,369.55 and 87,945.30

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Solution

The fourth proportional to 287,604.90, 431,369.55 and 87,945.30 is: 131,906.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,604.90 : 431,369.55 = 87,945.30 : x
  2. Step 2: Convert to fraction form
    287,604.90/431,369.55 = 87,945.30/x
  3. Step 3: Cross multiply
    287,604.90x = 431,369.55 × 87,945.30
  4. Step 4: Simplify right side
    287,604.90x = 37,936,924,485.62
  5. Step 5: Solve for x
    x = 37,936,924,485.62/287,604.90
  6. Step 6: Final answer
    x = 131,906.39

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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.