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Finding the Fourth Proportional to 74,120.90, 102,286.91 and 40,129.41

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Solution

The fourth proportional to 74,120.90, 102,286.91 and 40,129.41 is: 55,378.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,120.90 : 102,286.91 = 40,129.41 : x
  2. Step 2: Convert to fraction form
    74,120.90/102,286.91 = 40,129.41/x
  3. Step 3: Cross multiply
    74,120.90x = 102,286.91 × 40,129.41
  4. Step 4: Simplify right side
    74,120.90x = 4,104,713,349.02
  5. Step 5: Solve for x
    x = 4,104,713,349.02/74,120.90
  6. Step 6: Final answer
    x = 55,378.62

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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.