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Finding the Fourth Proportional to 79,121.64, 118,678.35 and 19,957.83

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Solution

The fourth proportional to 79,121.64, 118,678.35 and 19,957.83 is: 29,935.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,121.64 : 118,678.35 = 19,957.83 : x
  2. Step 2: Convert to fraction form
    79,121.64/118,678.35 = 19,957.83/x
  3. Step 3: Cross multiply
    79,121.64x = 118,678.35 × 19,957.83
  4. Step 4: Simplify right side
    79,121.64x = 2,368,562,333.98
  5. Step 5: Solve for x
    x = 2,368,562,333.98/79,121.64
  6. Step 6: Final answer
    x = 29,935.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.