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Finding the Fourth Proportional to 279,564.20, 418,715.40 and 129,489.21

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Solution

The fourth proportional to 279,564.20, 418,715.40 and 129,489.21 is: 193,941.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,564.20 : 418,715.40 = 129,489.21 : x
  2. Step 2: Convert to fraction form
    279,564.20/418,715.40 = 129,489.21/x
  3. Step 3: Cross multiply
    279,564.20x = 418,715.40 × 129,489.21
  4. Step 4: Simplify right side
    279,564.20x = 54,219,126,360.83
  5. Step 5: Solve for x
    x = 54,219,126,360.83/279,564.20
  6. Step 6: Final answer
    x = 193,941.60

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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.