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Finding the Fourth Proportional to 66,004.14, 91,048.95 and 39,120.78

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Solution

The fourth proportional to 66,004.14, 91,048.95 and 39,120.78 is: 53,964.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,004.14 : 91,048.95 = 39,120.78 : x
  2. Step 2: Convert to fraction form
    66,004.14/91,048.95 = 39,120.78/x
  3. Step 3: Cross multiply
    66,004.14x = 91,048.95 × 39,120.78
  4. Step 4: Simplify right side
    66,004.14x = 3,561,905,942.18
  5. Step 5: Solve for x
    x = 3,561,905,942.18/66,004.14
  6. Step 6: Final answer
    x = 53,964.89

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1.5x scale

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.