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Finding the Fourth Proportional to 71,072.93, 106,590.83 and 21,139.58

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Solution

The fourth proportional to 71,072.93, 106,590.83 and 21,139.58 is: 31,703.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,072.93 : 106,590.83 = 21,139.58 : x
  2. Step 2: Convert to fraction form
    71,072.93/106,590.83 = 21,139.58/x
  3. Step 3: Cross multiply
    71,072.93x = 106,590.83 × 21,139.58
  4. Step 4: Simplify right side
    71,072.93x = 2,253,284,739.40
  5. Step 5: Solve for x
    x = 2,253,284,739.40/71,072.93
  6. Step 6: Final answer
    x = 31,703.84

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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.