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Finding the Fourth Proportional to 66,021.81, 91,149.57 and 43,398.67

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Solution

The fourth proportional to 66,021.81, 91,149.57 and 43,398.67 is: 59,916.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,021.81 : 91,149.57 = 43,398.67 : x
  2. Step 2: Convert to fraction form
    66,021.81/91,149.57 = 43,398.67/x
  3. Step 3: Cross multiply
    66,021.81x = 91,149.57 × 43,398.67
  4. Step 4: Simplify right side
    66,021.81x = 3,955,770,109.07
  5. Step 5: Solve for x
    x = 3,955,770,109.07/66,021.81
  6. Step 6: Final answer
    x = 59,916.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.