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Finding the Fourth Proportional to 66,406.72, 91,731.02 and 53,071.44

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Solution

The fourth proportional to 66,406.72, 91,731.02 and 53,071.44 is: 73,310.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,406.72 : 91,731.02 = 53,071.44 : x
  2. Step 2: Convert to fraction form
    66,406.72/91,731.02 = 53,071.44/x
  3. Step 3: Cross multiply
    66,406.72x = 91,731.02 × 53,071.44
  4. Step 4: Simplify right side
    66,406.72x = 4,868,297,324.07
  5. Step 5: Solve for x
    x = 4,868,297,324.07/66,406.72
  6. Step 6: Final answer
    x = 73,310.31

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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.