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Finding the Fourth Proportional to 66,428.44, 91,668.54 and 36,213.10

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Solution

The fourth proportional to 66,428.44, 91,668.54 and 36,213.10 is: 49,972.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,428.44 : 91,668.54 = 36,213.10 : x
  2. Step 2: Convert to fraction form
    66,428.44/91,668.54 = 36,213.10/x
  3. Step 3: Cross multiply
    66,428.44x = 91,668.54 × 36,213.10
  4. Step 4: Simplify right side
    66,428.44x = 3,319,602,005.87
  5. Step 5: Solve for x
    x = 3,319,602,005.87/66,428.44
  6. Step 6: Final answer
    x = 49,972.60

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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.