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Finding the Fourth Proportional to 79,609.84, 109,799.39 and 49,378.21

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Solution

The fourth proportional to 79,609.84, 109,799.39 and 49,378.21 is: 68,103.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,609.84 : 109,799.39 = 49,378.21 : x
  2. Step 2: Convert to fraction form
    79,609.84/109,799.39 = 49,378.21/x
  3. Step 3: Cross multiply
    79,609.84x = 109,799.39 × 49,378.21
  4. Step 4: Simplify right side
    79,609.84x = 5,421,696,541.40
  5. Step 5: Solve for x
    x = 5,421,696,541.40/79,609.84
  6. Step 6: Final answer
    x = 68,103.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.