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Finding the Fourth Proportional to 43,211.81, 64,817.72 and 10,379.81

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Solution

The fourth proportional to 43,211.81, 64,817.72 and 10,379.81 is: 15,569.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,211.81 : 64,817.72 = 10,379.81 : x
  2. Step 2: Convert to fraction form
    43,211.81/64,817.72 = 10,379.81/x
  3. Step 3: Cross multiply
    43,211.81x = 64,817.72 × 10,379.81
  4. Step 4: Simplify right side
    43,211.81x = 672,795,767.30
  5. Step 5: Solve for x
    x = 672,795,767.30/43,211.81
  6. Step 6: Final answer
    x = 15,569.72

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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.