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Finding the Fourth Proportional to 79,478.40, 109,679.63 and 43,179.67

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Solution

The fourth proportional to 79,478.40, 109,679.63 and 43,179.67 is: 59,587.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,478.40 : 109,679.63 = 43,179.67 : x
  2. Step 2: Convert to fraction form
    79,478.40/109,679.63 = 43,179.67/x
  3. Step 3: Cross multiply
    79,478.40x = 109,679.63 × 43,179.67
  4. Step 4: Simplify right side
    79,478.40x = 4,735,930,229.12
  5. Step 5: Solve for x
    x = 4,735,930,229.12/79,478.40
  6. Step 6: Final answer
    x = 59,587.64

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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.