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Finding the Fourth Proportional to 79,640.88, 109,911.78 and 43,838.16

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Solution

The fourth proportional to 79,640.88, 109,911.78 and 43,838.16 is: 60,500.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,640.88 : 109,911.78 = 43,838.16 : x
  2. Step 2: Convert to fraction form
    79,640.88/109,911.78 = 43,838.16/x
  3. Step 3: Cross multiply
    79,640.88x = 109,911.78 × 43,838.16
  4. Step 4: Simplify right side
    79,640.88x = 4,818,330,197.52
  5. Step 5: Solve for x
    x = 4,818,330,197.52/79,640.88
  6. Step 6: Final answer
    x = 60,500.72

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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.