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Finding the Fourth Proportional to 212,763.38, 319,217.98 and 72,620.42

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Solution

The fourth proportional to 212,763.38, 319,217.98 and 72,620.42 is: 108,955.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,763.38 : 319,217.98 = 72,620.42 : x
  2. Step 2: Convert to fraction form
    212,763.38/319,217.98 = 72,620.42/x
  3. Step 3: Cross multiply
    212,763.38x = 319,217.98 × 72,620.42
  4. Step 4: Simplify right side
    212,763.38x = 23,181,744,395.65
  5. Step 5: Solve for x
    x = 23,181,744,395.65/212,763.38
  6. Step 6: Final answer
    x = 108,955.52

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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.