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Finding the Fourth Proportional to 79,209.29, 109,308.79 and 47,385.67

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Solution

The fourth proportional to 79,209.29, 109,308.79 and 47,385.67 is: 65,392.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,209.29 : 109,308.79 = 47,385.67 : x
  2. Step 2: Convert to fraction form
    79,209.29/109,308.79 = 47,385.67/x
  3. Step 3: Cross multiply
    79,209.29x = 109,308.79 × 47,385.67
  4. Step 4: Simplify right side
    79,209.29x = 5,179,670,251.04
  5. Step 5: Solve for x
    x = 5,179,670,251.04/79,209.29
  6. Step 6: Final answer
    x = 65,392.21

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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.