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Finding the Fourth Proportional to 212,939.80, 319,020.90 and 173,282.20

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Solution

The fourth proportional to 212,939.80, 319,020.90 and 173,282.20 is: 259,606.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,939.80 : 319,020.90 = 173,282.20 : x
  2. Step 2: Convert to fraction form
    212,939.80/319,020.90 = 173,282.20/x
  3. Step 3: Cross multiply
    212,939.80x = 319,020.90 × 173,282.20
  4. Step 4: Simplify right side
    212,939.80x = 55,280,643,397.98
  5. Step 5: Solve for x
    x = 55,280,643,397.98/212,939.80
  6. Step 6: Final answer
    x = 259,606.91

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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.