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Finding the Fourth Proportional to 79,616.94, 109,913.67 and 61,671.66

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Solution

The fourth proportional to 79,616.94, 109,913.67 and 61,671.66 is: 85,139.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,616.94 : 109,913.67 = 61,671.66 : x
  2. Step 2: Convert to fraction form
    79,616.94/109,913.67 = 61,671.66/x
  3. Step 3: Cross multiply
    79,616.94x = 109,913.67 × 61,671.66
  4. Step 4: Simplify right side
    79,616.94x = 6,778,558,485.59
  5. Step 5: Solve for x
    x = 6,778,558,485.59/79,616.94
  6. Step 6: Final answer
    x = 85,139.65

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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.