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Finding the Fourth Proportional to 279,226.80, 418,840.20 and 172,938.60

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Solution

The fourth proportional to 279,226.80, 418,840.20 and 172,938.60 is: 259,407.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,226.80 : 418,840.20 = 172,938.60 : x
  2. Step 2: Convert to fraction form
    279,226.80/418,840.20 = 172,938.60/x
  3. Step 3: Cross multiply
    279,226.80x = 418,840.20 × 172,938.60
  4. Step 4: Simplify right side
    279,226.80x = 72,433,637,811.72
  5. Step 5: Solve for x
    x = 72,433,637,811.72/279,226.80
  6. Step 6: Final answer
    x = 259,407.90

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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.