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Finding the Fourth Proportional to 666,954, 1,000,128.60 and 287,695.80

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Solution

The fourth proportional to 666,954, 1,000,128.60 and 287,695.80 is: 431,413.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,954 : 1,000,128.60 = 287,695.80 : x
  2. Step 2: Convert to fraction form
    666,954/1,000,128.60 = 287,695.80/x
  3. Step 3: Cross multiply
    666,954x = 1,000,128.60 × 287,695.80
  4. Step 4: Simplify right side
    666,954x = 287,732,797,679.88
  5. Step 5: Solve for x
    x = 287,732,797,679.88/666,954
  6. Step 6: Final answer
    x = 431,413.26

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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.