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Finding the Fourth Proportional to 74,290.80, 102,520.70 and 40,299.21

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Solution

The fourth proportional to 74,290.80, 102,520.70 and 40,299.21 is: 55,612.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,290.80 : 102,520.70 = 40,299.21 : x
  2. Step 2: Convert to fraction form
    74,290.80/102,520.70 = 40,299.21/x
  3. Step 3: Cross multiply
    74,290.80x = 102,520.70 × 40,299.21
  4. Step 4: Simplify right side
    74,290.80x = 4,131,503,218.65
  5. Step 5: Solve for x
    x = 4,131,503,218.65/74,290.80
  6. Step 6: Final answer
    x = 55,612.58

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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.