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Finding the Fourth Proportional to 279,212.80, 418,819.20 and 172,924.60

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Solution

The fourth proportional to 279,212.80, 418,819.20 and 172,924.60 is: 259,386.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,212.80 : 418,819.20 = 172,924.60 : x
  2. Step 2: Convert to fraction form
    279,212.80/418,819.20 = 172,924.60/x
  3. Step 3: Cross multiply
    279,212.80x = 418,819.20 × 172,924.60
  4. Step 4: Simplify right side
    279,212.80x = 72,424,142,632.32
  5. Step 5: Solve for x
    x = 72,424,142,632.32/279,212.80
  6. Step 6: Final answer
    x = 259,386.90

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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.