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Finding the Fourth Proportional to 639,445.74, 958,960.94 and 212,866.98

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Solution

The fourth proportional to 639,445.74, 958,960.94 and 212,866.98 is: 319,231.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,445.74 : 958,960.94 = 212,866.98 : x
  2. Step 2: Convert to fraction form
    639,445.74/958,960.94 = 212,866.98/x
  3. Step 3: Cross multiply
    639,445.74x = 958,960.94 × 212,866.98
  4. Step 4: Simplify right side
    639,445.74x = 204,131,119,235.76
  5. Step 5: Solve for x
    x = 204,131,119,235.76/639,445.74
  6. Step 6: Final answer
    x = 319,231.34

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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.