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Finding the Fourth Proportional to 279,402, 418,811.25 and 129,518.70

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Solution

The fourth proportional to 279,402, 418,811.25 and 129,518.70 is: 194,142.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,402 : 418,811.25 = 129,518.70 : x
  2. Step 2: Convert to fraction form
    279,402/418,811.25 = 129,518.70/x
  3. Step 3: Cross multiply
    279,402x = 418,811.25 × 129,518.70
  4. Step 4: Simplify right side
    279,402x = 54,243,888,645.38
  5. Step 5: Solve for x
    x = 54,243,888,645.38/279,402
  6. Step 6: Final answer
    x = 194,142.81

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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.