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Finding the Fourth Proportional to 666,913.12, 1,000,067.12 and 287,654.64

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Solution

The fourth proportional to 666,913.12, 1,000,067.12 and 287,654.64 is: 431,351.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,913.12 : 1,000,067.12 = 287,654.64 : x
  2. Step 2: Convert to fraction form
    666,913.12/1,000,067.12 = 287,654.64/x
  3. Step 3: Cross multiply
    666,913.12x = 1,000,067.12 × 287,654.64
  4. Step 4: Simplify right side
    666,913.12x = 287,673,947,379.44
  5. Step 5: Solve for x
    x = 287,673,947,379.44/666,913.12
  6. Step 6: Final answer
    x = 431,351.46

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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.