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Finding the Fourth Proportional to 212,763.89, 319,218.73 and 72,620.93

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Solution

The fourth proportional to 212,763.89, 319,218.73 and 72,620.93 is: 108,956.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,763.89 : 319,218.73 = 72,620.93 : x
  2. Step 2: Convert to fraction form
    212,763.89/319,218.73 = 72,620.93/x
  3. Step 3: Cross multiply
    212,763.89x = 319,218.73 × 72,620.93
  4. Step 4: Simplify right side
    212,763.89x = 23,181,959,449.93
  5. Step 5: Solve for x
    x = 23,181,959,449.93/212,763.89
  6. Step 6: Final answer
    x = 108,956.27

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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.