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Finding the Fourth Proportional to 72,571.20, 100,153.92 and 40,747.20

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Solution

The fourth proportional to 72,571.20, 100,153.92 and 40,747.20 is: 56,234.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,571.20 : 100,153.92 = 40,747.20 : x
  2. Step 2: Convert to fraction form
    72,571.20/100,153.92 = 40,747.20/x
  3. Step 3: Cross multiply
    72,571.20x = 100,153.92 × 40,747.20
  4. Step 4: Simplify right side
    72,571.20x = 4,080,991,809.02
  5. Step 5: Solve for x
    x = 4,080,991,809.02/72,571.20
  6. Step 6: Final answer
    x = 56,234.32

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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.