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Finding the Fourth Proportional to 675,939, 932,796.66 and 421,290

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Solution

The fourth proportional to 675,939, 932,796.66 and 421,290 is: 581,380.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    675,939 : 932,796.66 = 421,290 : x
  2. Step 2: Convert to fraction form
    675,939/932,796.66 = 421,290/x
  3. Step 3: Cross multiply
    675,939x = 932,796.66 × 421,290
  4. Step 4: Simplify right side
    675,939x = 392,977,904,891.40
  5. Step 5: Solve for x
    x = 392,977,904,891.40/675,939
  6. Step 6: Final answer
    x = 581,380.72

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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.