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Finding the Fourth Proportional to 79,971.80, 119,957.86 and 20,807.38

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Solution

The fourth proportional to 79,971.80, 119,957.86 and 20,807.38 is: 31,211.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,971.80 : 119,957.86 = 20,807.38 : x
  2. Step 2: Convert to fraction form
    79,971.80/119,957.86 = 20,807.38/x
  3. Step 3: Cross multiply
    79,971.80x = 119,957.86 × 20,807.38
  4. Step 4: Simplify right side
    79,971.80x = 2,496,008,777.01
  5. Step 5: Solve for x
    x = 2,496,008,777.01/79,971.80
  6. Step 6: Final answer
    x = 31,211.11

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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.