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Finding the Fourth Proportional to 61,317.81, 91,942.02 and 21,318.39

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Solution

The fourth proportional to 61,317.81, 91,942.02 and 21,318.39 is: 31,965.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,317.81 : 91,942.02 = 21,318.39 : x
  2. Step 2: Convert to fraction form
    61,317.81/91,942.02 = 21,318.39/x
  3. Step 3: Cross multiply
    61,317.81x = 91,942.02 × 21,318.39
  4. Step 4: Simplify right side
    61,317.81x = 1,960,055,839.75
  5. Step 5: Solve for x
    x = 1,960,055,839.75/61,317.81
  6. Step 6: Final answer
    x = 31,965.52

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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.