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Finding the Fourth Proportional to 66,390.50, 91,618.97 and 39,533.91

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Solution

The fourth proportional to 66,390.50, 91,618.97 and 39,533.91 is: 54,556.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,390.50 : 91,618.97 = 39,533.91 : x
  2. Step 2: Convert to fraction form
    66,390.50/91,618.97 = 39,533.91/x
  3. Step 3: Cross multiply
    66,390.50x = 91,618.97 × 39,533.91
  4. Step 4: Simplify right side
    66,390.50x = 3,622,055,916.60
  5. Step 5: Solve for x
    x = 3,622,055,916.60/66,390.50
  6. Step 6: Final answer
    x = 54,556.84

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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.