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Finding the Fourth Proportional to 72,401.96, 99,914.64 and 40,138.64

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Solution

The fourth proportional to 72,401.96, 99,914.64 and 40,138.64 is: 55,391.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,401.96 : 99,914.64 = 40,138.64 : x
  2. Step 2: Convert to fraction form
    72,401.96/99,914.64 = 40,138.64/x
  3. Step 3: Cross multiply
    72,401.96x = 99,914.64 × 40,138.64
  4. Step 4: Simplify right side
    72,401.96x = 4,010,437,765.69
  5. Step 5: Solve for x
    x = 4,010,437,765.69/72,401.96
  6. Step 6: Final answer
    x = 55,391.29

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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.