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Finding the Fourth Proportional to 72,912.45, 100,619.20 and 39,378.45

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Solution

The fourth proportional to 72,912.45, 100,619.20 and 39,378.45 is: 54,342.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,912.45 : 100,619.20 = 39,378.45 : x
  2. Step 2: Convert to fraction form
    72,912.45/100,619.20 = 39,378.45/x
  3. Step 3: Cross multiply
    72,912.45x = 100,619.20 × 39,378.45
  4. Step 4: Simplify right side
    72,912.45x = 3,962,228,341.28
  5. Step 5: Solve for x
    x = 3,962,228,341.28/72,912.45
  6. Step 6: Final answer
    x = 54,342.27

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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.